<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/17/setting-a-creation-complete-effect-on-a-button-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        creationComplete="init();">

    <mx:Script>
        <![CDATA[
            import mx.controls.Button;
            import mx.effects.Zoom;
            
            private var button:Button;
            
            private function init():void {
                button = new Button();
                button.label = "Button";
                button.setStyle("creationCompleteEffect", Zoom);
                addChild(button);
            }
        ]]>
    </mx:Script>

</mx:Application>