Skin with Embedded Images
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="horizontal" backgroundColor="#FFFFFF"> <mx:Button label="" upSkin="@Embed('a.png')" overSkin="@Embed('a.png')" downSkin="@Embed('a.png')" disabledSkin="@Embed('a.png')" /> </mx:Application>