Synchronous calls inside the UIThread are made by invoking the `execInsideUISync{}` method. This method is equivalent to calling `edt{}` in Swing.

Example:

    class MyController {
        def model    def action1 = {
            // will be invoked inside the UI thread by default (pre 0.9.2)
            def value = model.value
            Thread.start {
                // do some calculations
                execInsideUISync {
                    // back inside the UI thread
                    model.result = …
                }
            }
        }    def action2 = {
            // will be invoked outside of the UI thread by default (post 0.9.2)
            def value = model.value
            // do some calculations
            execInsideUISync {
                // back inside the UI thread
                model.result = …
            }
        }
    }