mustella/tests/gumbo/layout3D/swfs/comps/FxListButtonsComp.mxml

  <s:List xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:mx="library://ns.adobe.com/flex/mx"
  xmlns:s="library://ns.adobe.com/flex/spark"  useVirtualLayout="true">
                <mx:ArrayCollection>
                    <s:Button label="Ann"  ></s:Button>
                    <s:Button label="Tom"  ></s:Button>
                    <s:Button label="John" ></s:Button>
                    <s:Button label="Jane" ></s:Button>
                    <s:Button label="Bill" ></s:Button>
                </mx:ArrayCollection>
           <s:itemRenderer>
                <fx:Component>
<s:ItemRenderer autoDrawBackground = "false"  >

     <s:states>
         <s:State name="normal" />
         <s:State name="selected" />
         <s:State name="hovered" />
     </s:states>

     <fx:Script>
     <![CDATA[
        import mx.core.IVisualElement;

        override public function set data(value:Object):void {
            if(value == null)
                return;

            customDataRenderingGroup.removeAllElements();
            customDataRenderingGroup.addElement(value as IVisualElement);
        }
     ]]>
    </fx:Script>

 <s:Rect left="0" right="0" top="0" bottom="0">
    <s:fill>
        <mx:SolidColor color="0x00FF00"
            alpha="0" alpha.hovered="0.2" alpha.selected="0.8" />
    </s:fill>
 </s:Rect>
 <s:Group id="customDataRenderingGroup" verticalCenter="0" left="2" right="2" top="2" bottom="2"/>

 </s:ItemRenderer>
                </fx:Component>
            </s:itemRenderer>
    </s:List>