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## griffon.core
[Java] Interface MVCHandler

    public interface MVCHandler

Base contract for classes that can manipulate MVC groups. There are 3 types of methods used for instantiating a group:

`buildMVCGroup()` - creates a new group instance returning all members.

`createMVCGroup()` - creates a new group instance returning only Model, View and Controller members.

`withMVCGroup()` - creates a new group instance and destroys it immediately after it has been processed by the callback.

It's worth mentioning that the value of the `mvcName` parameter must be unique otherwise a collision will occur. When that happens the application will report and exception and terminate. This behavior can be configured to be more lenient, by defining a configuration flag `griffon.mvcid.collision` in `Config.groovy`.
Accepted values are

warning - reports the error but allows the application to continue. Destroys the existing group before continuing.

exception - reports the error and terminates the application. this is the default behavior.

Authors:
  Andres Almiray

Since:
  0.9.3

Method Summary
`MVCGroup` | `buildMVCGroup(String mvcType)` Instantiates an MVC group of the specified type.
`MVCGroup` | `buildMVCGroup(String mvcType, String mvcName)` Instantiates an MVC group of the specified type with a particular name.
`MVCGroup` | `buildMVCGroup(Map args, String mvcType)` Instantiates an MVC group of the specified type with additional variables.
`MVCGroup` | `buildMVCGroup(String mvcType, Map args)` Instantiates an MVC group of the specified type with additional variables.
`MVCGroup` | `buildMVCGroup(Map args, String mvcType, String mvcName)` Instantiates an MVC group of the specified type with a particular name.
`MVCGroup` | `buildMVCGroup(String mvcType, String mvcName, Map args)` Instantiates an MVC group of the specified type with a particular name.
`List` | `createMVCGroup(String mvcType)` Instantiates an MVC group of the specified type returning only the MVC parts.
`List` | `createMVCGroup(Map args, String mvcType)` Instantiates an MVC group of the specified type with additional variables.
`List` | `createMVCGroup(String mvcType, Map args)` Instantiates an MVC group of the specified type with additional variables.
`List` | `createMVCGroup(String mvcType, String mvcName)` Instantiates an MVC group of the specified type with a particular name.
`List` | `createMVCGroup(Map args, String mvcType, String mvcName)` Instantiates an MVC group of the specified type with a particular name.
`List` | `createMVCGroup(String mvcType, String mvcName, Map args)` Instantiates an MVC group of the specified type with a particular name.
`void` | `destroyMVCGroup(String mvcName)` Destroys an MVC group identified by a particular name.
`void` | `withMVCGroup(String mvcType, Closure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, String mvcName, Closure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, String mvcName, Map args, Closure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(Map args, String mvcType, String mvcName, Closure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, Map args, Closure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(Map args, String mvcType, Closure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, MVCClosure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, String mvcName, MVCClosure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, String mvcName, Map args, MVCClosure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(Map args, String mvcType, String mvcName, MVCClosure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(String mvcType, Map args, MVCClosure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.
`void` | `withMVCGroup(Map args, String mvcType, MVCClosure handler)` Instantiates an MVC group of the specified type then destroys it after it has been handled.

Method Detail

### buildMVCGroup

    public MVCGroup buildMVCGroup(String mvcType)

  Instantiates an MVC group of the specified type.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be created as follows

       Map fooGroup = buildMVCGroup('foo')
       assert (fooGroup.controller instanceof FooController)

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
  Returns:
    an MVCGroup instance of the desired type

### buildMVCGroup

    public MVCGroup buildMVCGroup(String mvcType, String mvcName)

  Instantiates an MVC group of the specified type with a particular name.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be created as follows

       Map fooGroup = buildMVCGroup('foo', 'foo' + System.currentTimeMillis())
       assert (fooGroup.controller instanceof FooController)

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
  Returns:
    an MVCGroup instance of the desired type

### buildMVCGroup

    public MVCGroup buildMVCGroup(Map args, String mvcType)

  Instantiates an MVC group of the specified type with additional variables.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
           'bar' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.BarView'
               controller = 'com.acme.BarController'
           }
       }

  Notice that groups "foo" and "bar share the same model type, We can make them share the same model instance by creating the groups in the following way:

       Map fooGroup = buildMVCGroup('foo')
       Map barGroup = buildMVCGroup('bar', model: fooGroup.model)
       assert fooGroup.model == barGroup.model

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
  Returns:
    an MVCGroup instance of the desired type

### buildMVCGroup

    public MVCGroup buildMVCGroup(String mvcType, Map args)

  Instantiates an MVC group of the specified type with additional variables.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
           'bar' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.BarView'
               controller = 'com.acme.BarController'
           }
       }

  Notice that groups "foo" and "bar share the same model type, We can make them share the same model instance by creating the groups in the following way:

       Map fooGroup = buildMVCGroup('foo')
       Map barGroup = buildMVCGroup('bar', model: fooGroup.model)
       assert fooGroup.model == barGroup.model

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
  Returns:
    an MVCGroup instance of the desired type

### buildMVCGroup

    public MVCGroup buildMVCGroup(Map args, String mvcType, String mvcName)

  Instantiates an MVC group of the specified type with a particular name.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  We can create two instances of the same group that share the same model instance in the following way:

       Map fooGroup1 = buildMVCGroup('foo', 'foo1')
       Map fooGroup2 = buildMVCGroup('bar', 'foo2', model: fooGroup1.model)
       assert fooGroup1.model == fooGroup2.model

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
  Returns:
    an MVCGroup instance of the desired type

### buildMVCGroup

    public MVCGroup buildMVCGroup(String mvcType, String mvcName, Map args)

  Instantiates an MVC group of the specified type with a particular name.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  We can create two instances of the same group that share the same model instance in the following way:

       Map fooGroup1 = buildMVCGroup('foo', 'foo1')
       Map fooGroup2 = buildMVCGroup('bar', 'foo2', model: fooGroup1.model)
       assert fooGroup1.model == fooGroup2.model

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
  Returns:
    an MVCGroup instance of the desired type

### createMVCGroup

    public List createMVCGroup(String mvcType)

  Instantiates an MVC group of the specified type returning only the MVC parts.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be created as follows

       def (m, v, c) = createMVCGroup('foo')
       assert (c instanceof FooController)

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
  Returns:
    a List with the canonical MVC members of the group

### createMVCGroup

    public List createMVCGroup(Map args, String mvcType)

  Instantiates an MVC group of the specified type with additional variables.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
           'bar' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.BarView'
               controller = 'com.acme.BarController'
           }
       }

  Notice that groups "foo" and "bar share the same model type, We can make them share the same model instance by creating the groups in the following way:

       def (m1, v1, c1) = createMVCGroup('foo')
       def (m2, v2, c2) = createMVCGroup('bar', model: m1)
       assert fm1 == m2

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
  Returns:
    a List with the canonical MVC members of the group

### createMVCGroup

    public List createMVCGroup(String mvcType, Map args)

  Instantiates an MVC group of the specified type with additional variables.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
           'bar' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.BarView'
               controller = 'com.acme.BarController'
           }
       }

  Notice that groups "foo" and "bar share the same model type, We can make them share the same model instance by creating the groups in the following way:

       def (m1, v1, c1) = createMVCGroup('foo')
       def (m2, v2, c2) = createMVCGroup('bar', model: m1)
       assert fm1 == m2

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
  Returns:
    a List with the canonical MVC members of the group

### createMVCGroup

    public List createMVCGroup(String mvcType, String mvcName)

  Instantiates an MVC group of the specified type with a particular name.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
            }
       }

  An instance of the "foo" group can be created as follows

       def (m, v, c) = createMVCGroup('foo', 'foo' + System.currenttimeMillis())
       assert (c instanceof FooController)

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
  Returns:
    a List with the canonical MVC members of the group

### createMVCGroup

    public List createMVCGroup(Map args, String mvcType, String mvcName)

  Instantiates an MVC group of the specified type with a particular name.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  We can create two instances of the same group that share the same model instance in the following way:

       def (m1, v1, c1) = createMVCGroup('foo', 'foo1')
       def (m2, v2, c2) = createMVCGroup('foo', 'foo2', model: m1)
       assert fm1 == m2

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
  Returns:
    a List with the canonical MVC members of the group

### createMVCGroup

    public List createMVCGroup(String mvcType, String mvcName, Map args)

  Instantiates an MVC group of the specified type with a particular name.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios

  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  We can create two instances of the same group that share the same model instance in the following way:

       def (m1, v1, c1) = createMVCGroup('foo', 'foo1')
       def (m2, v2, c2) = createMVCGroup('foo', 'foo2', model: m1)
       assert fm1 == m2

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration or if a group with the same mvcName exists already.
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
  Returns:
    a List with the canonical MVC members of the group

### destroyMVCGroup

    public void destroyMVCGroup(String mvcName)

  Destroys an MVC group identified by a particular name.

  ATTENTION: make sure to call the super implementation if you override this method otherwise group references will not be kept up to date.

  Parameters:
    `mvcName` - the name of the group to destroy and dispose.

### withMVCGroup

    public void withMVCGroup(String mvcType, Closure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup('foo') { m, v, c->
           m.someProperty = someValue
           c.invokeAnAction()
       }

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, String mvcName, Closure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup('foo', 'foo1') { m, v, c->
           m.someProperty = someValue
           c.invokeAnAction()
       }

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, String mvcName, Map args, Closure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup('foo', 'foo1') { m, v, c->
           m.someProperty = someValue
           c.invokeAnAction()
       }

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(Map args, String mvcType, String mvcName, Closure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup('foo', 'foo1') { m, v, c->
           m.someProperty = someValue
           c.invokeAnAction()
       }

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, Map args, Closure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup('foo', 'foo1') { m, v, c->
           m.someProperty = someValue
           c.invokeAnAction()
       }

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(Map args, String mvcType, Closure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup('foo', 'foo1') { m, v, c->
           m.someProperty = someValue
           c.invokeAnAction()
       }

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, MVCClosure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
          }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup("foo", new MVCClosure<FooModel, FooView, FooController>() {
           public void call(FooModel m, FooView v, FooController c) {
               m.setSomeProperty(someValue);
               c.invokeAnAction();
           }
       });

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, String mvcName, MVCClosure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       withMVCGroup("foo", "foo1", new MVCClosure<FooModel, FooView, FooController>() {
           public void call(FooModel m, FooView v, FooController c) {
               m.setSomeProperty(someValue);
               c.invokeAnAction();
           }
       });

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, String mvcName, Map args, MVCClosure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       Map map = ... // initialized elsewhere
       withMVCGroup("foo", "foo1", map, new MVCClosure<FooModel, FooView, FooController>() {
          public void call(FooModel m, FooView v, FooController c) {
              m.setSomeProperty(someValue);
              c.invokeAnAction();
          }
       });

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(Map args, String mvcType, String mvcName, MVCClosure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
           }
       }

  An instance of the "foo" group can be used as follows

       Map map = ... // initialized elsewhere
       withMVCGroup("foo", "foo1", map, new MVCClosure<FooModel, FooView, FooController>() {
          public void call(FooModel m, FooView v, FooController c) {
              m.setSomeProperty(someValue);
              c.invokeAnAction();
          }
       });

  MVC groups must have an unique name.
  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
    `mvcName` - the name to assign to the built group.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(String mvcType, Map args, MVCClosure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
          }
       }

  An instance of the "foo" group can be used as follows

       Map map = ... // initialized elsewhere
       withMVCGroup("foo", map, new MVCClosure<FooModel, FooView, FooController>() {
          public void call(FooModel m, FooView v, FooController c) {
              m.setSomeProperty(someValue);
              c.invokeAnAction();
          }
       });

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `mvcType` - the type of group to build.
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

### withMVCGroup

    public void withMVCGroup(Map args, String mvcType, MVCClosure handler)

  Instantiates an MVC group of the specified type then destroys it after it has been handled.

  This method is of particular interest when working with short lived MVC groups such as those used to build dialogs.

  MVC Groups must be previously configured with the application's metadata before they can be used. This registration process usually takes place automatically at boot time. The type of the group can be normally found in the application's configuration file.

  The `args` Map can contain any value that will be used in one of the following scenarios
  - The key matches a member definition; the value will be used as the instance of such member.
  - The key does not match a member definition, the value is assumed to be a property that can be set on any MVC member of the group.
  For example, with the following entry available in `Application.groovy`

       mvcGroups {
           'foo' {
               model      = 'com.acme.FooModel'
               view       = 'com.acme.FooView'
               controller = 'com.acme.FooController'
          }
       }

  An instance of the "foo" group can be used as follows

       Map map = ... // initialized elsewhere
       withMVCGroup("foo", map, new MVCClosure<FooModel, FooView, FooController>() {
          public void call(FooModel m, FooView v, FooController c) {
              m.setSomeProperty(someValue);
              c.invokeAnAction();
          }
       });

  throws:
    griffon.exceptions.MVCGroupInstantiationException - if the type specified is not found in the application's configuration
  Parameters:
    `args` - any useful values that can be set as properties on each MVC member or that identify a member that can be shared with other groups.
    `mvcType` - the type of group to build.
    `handler` - a code block used to configure and manage the instantiated group
  Since:
    0.9.3

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