<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" horizontalAlign="center" verticalAlign="center"> <mx:Button id="myButton" label="Hello World!" click="onClick();"/> <mx:Button id="myButton2" label="Hello World!" width="300" click="onClick();"/> <mx:Script> <![CDATA[ import mx.controls.Alert; private function onClick():void { Alert.show("HelloWorld button is Clicked."); } ]]> </mx:Script> </mx:Application>