setStyle 로 이펙트 주기

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical" creationComplete="createEffect(event);">
 <mx:Script>
  <![CDATA[
   import flash.events.Event;
   import mx.effects.Zoom;
   
   private function createEffect(eventObj:Event):void{
    var zEffect:Zoom = new Zoom();
   
    zEffect.duration = 2000;
    zEffect.zoomHeightTo = 1.5;
    zEffect.zoomWidthTo = 1.5;
   
    myB.setStyle("mouseDownEffect", zEffect);
   }
  ]]>
 </mx:Script>
 
 <mx:Button id="myB" label="Zoom Me" />
</mx:Application>