event listener on exiting

[andrew2312]

Здравствуйте! Хочу сделать, чтобы при закрытии приложения выскакивал popUp.
Следующий код не помогает.

<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
					   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx" 
					   creationComplete="creationCompleteHandler()" 
					   width="1200" height="800">

public function creationCompleteHandler():void{
        NativeApplication.nativeApplication.addEventListener(Event.EXITING,onExitHandler);
}
private function onExitHandler(event:Event):void{
	event.preventDefault();
	var winExit:ExitApplicationDialog = PopUpManager.createPopUp(this, ExitApplicationDialog, true) as ExitApplicationDialog;
	PopUpManager.centerPopUp(winExit);
}

</s:WindowedApplication>