mustella/tests/gumbo/components/Panel/SWFs/Comps/CustomSimplePanel.mxml

<s:Panel 
    xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:mx="library://ns.adobe.com/flex/mx" 
    xmlns:s="library://ns.adobe.com/flex/spark"
    minWidth="200" minHeight="200">    	
	
	<s:Button id="myBtn" label="Spark Button" left="5" top="5"/>
   				    	    	    	       
</s:Panel>