Flex图片按钮

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
    <mx:Style>  
        .myCustomButton {
               overSkin:Embed(source="assets/overIconImage.gif");
               upSkin:Embed(source="assets/upIconImage.gif");
               downSkin:Embed(source="assets/downIconImage.gif");
        }
    </mx:Style>
    <mx:Button label="" x="10" y="10" styleName="myCustomButton" width="30" height="30"/>
</mx:Application>