<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="horizontal">
    <mx:Button label="Red" upSkin="gelOffSkin" downSkin="gelUpSkin" overSkin="gelOffSkin" borderColor="red" />
    <mx:Button label="Yellow" upSkin="gelOffSkin" downSkin="gelUpSkin" overSkin="gelOffSkin" borderColor="yellow" />
    <mx:Button label="Green" upSkin="gelOffSkin" downSkin="gelUpSkin" overSkin="gelOffSkin" borderColor="green" />
    <mx:Button label="Blue" upSkin="gelOffSkin" downSkin="gelUpSkin" overSkin="gelOffSkin" borderColor="blue" />
</mx:Application>