Call a function when application is created completed
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="doSomething()">
<mx:Script> public var s:Boolean; public function doSomething():void {
s = label1.visible;
label1.text = String(s);
}
</mx:Script>
<mx:Label id="label1" />
</mx:Application>