Use Zoom class to set zoom effect
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="createEffect(event);">
<mx:Script>
import flash.events.Event;
import mx.effects.Zoom;
private function createEffect(eventObj:Event):void {
var zEffect:Zoom = new Zoom();
zEffect.duration = 2000;
zEffect.zoomHeightTo = 3.50;
zEffect.zoomWidthTo = 1.50;
myB.setStyle("mouseDownEffect", zEffect);
}
</mx:Script>
<mx:Button id="myB" />
</mx:Application>
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