Using MXML to define the effect
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Resize id="resizeLarge" target="{myTA}" widthTo="150" heightTo="150" duration="750" /> <mx:Canvas height="300" width="400" borderStyle="solid"> <mx:Button label="Start" x="50" y="50" click="resizeLarge.end();resizeLarge.play();" /> <mx:TextArea x="100" y="100" id="myTA" text="Here is some text." /> </mx:Canvas> </mx:Application>