A skin class
<?xml version="1.0" encoding="utf-8"?> <mx:Application xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="http://www.adobe.com/2006/mxml"> <s:SparkSkin> <s:Rect height="100%" width="100%"> <s:fill> <mx:LinearGradient> <mx:entries> <mx:GradientEntry color="#92A1B9" /> </mx:entries> </mx:LinearGradient> </s:fill> </s:Rect> <s:Group id="contentGroup" left="5" top="5" right="5" bottom="5"> <s:layout> <s:BasicLayout /> </s:layout> </s:Group> </s:SparkSkin> </mx:Application>