flex4.5 spark datagrid itemrenderer

<?xml version="1.0" encoding="utf-8"?><s:GridItemRenderer xmlns:fx="http://ns.adobe.com/mxml/2009"                    xmlns:s="library://ns.adobe.com/flex/spark"                    xmlns:mx="library://ns.adobe.com/flex/mx" updateComplete="griditemrenderer_updateCompleteHandler(event)">    <fx:Script>        <![CDATA[            import mx.controls.Alert;            import mx.events.FlexEvent;            import mx.formatters.NumberBaseRoundType;            import mx.formatters.NumberFormatter;             protected function griditemrenderer_updateCompleteHandler(event:FlexEvent):void            {                var val:Number = new Number(data[column.dataField]);                var r:Number = (1 - val) * 255                var g:Number = val * 255;                var b:Number = 0;                 fillColor.color = (r<<16) | (g<<8) | b;            }         ]]>    </fx:Script>    <s:Rect top="0″ bottom="0″ right="0″ left="0″>         <s:fill>             <s:SolidColor id="fillColor" color="#E0E0E0″ alpha="0.5″/>         </s:fill>     </s:Rect>     <s:Label id="lblData" top="9″ left="7″ color="0×505050″ alpha="0.5″/> </s:GridItemRenderer>