Mega Code Archive
Replace MX Button controls up, over, and down skins with individual symbols from a SWF file
@namespace mx "library://ns.adobe.com/flex/mx";
mx|Button {
upSkin: Embed(source='a.swf',
symbol='MyUpSkin');
overSkin: Embed(source='a.swf',
symbol='MyOverSkin');
downSkin: Embed(source='a.swf',
symbol='MyDownSkin');
}