ItemRenderer For RowNumber

<?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" clipAndEnableScrolling="true">

    <fx:Script>
        <![CDATA[

        ]]>
    </fx:Script>

    <s:Label id="lblData" top="9" left="7" text="{this.rowIndex+1}"/>

</s:GridItemRenderer>