Making sure a block of code is executed outside the UIThread is made by invoking the `execOutsideUI{}` method. This method is equivalent to calling `doOutside{}` 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
            execOutsideUI {
                // do some calculations
                execInsideUIAsync {
                    // 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
            execInsideUIAsync {
                // back inside the UI Thread
                model.result = …
                execOutsideUI {
                    // do more calculations
                }
            }
        }
    }