Now that you know there are several ways to instantiate MVC groups we can go back to customizing them.

The simples way is to pass in new values as part of the arguments map that mvcGroupInit receives, for example

    def group = app.mvcGroupManager.buildMVCGroup('foo', [key: 'foo'])

However is you wish to use the special `config` key that every MVC group configuration may have then you must instantiate the group in the following way

    def configuration = app.mvcGroupManager.cloneMVCConfiguration('foo', [key: 'someValue'])
    def group = configuration.create()

Note that you can still send custom arguments to the `create()` method.