To remove watermark while using Advanced Datagrid control

Code to remove the water mark while using advanced data grid control:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" minWidth="955" minHeight="600">
 <mx:Script>
  <![CDATA[
   import mx.events.FlexEvent;

   protected function remove_watermark():void
   {
    //test.removeChildAt(test.numChildren-1);
    (test.getChildAt(test.numChildren-1) as TextField).htmlText = " ";
   }

  ]]> 
 </mx:Script>
<!-- <mx:Script> 
  <![CDATA[
   [Bindable]
   [Embed(source="assets/sap.png")]
   public var sapicon:Class;
  ]]>
 </mx:Script>-->
 <mx:AdvancedDataGrid id="test" creationComplete="remove_watermark()">
  <mx:dataProvider>
   <mx:Object Artist="Jlo" Price="60" Album="enchanted"/>    
   <mx:Object Artist="Shakira" Price="90" Album="woddoo"/>  
  </mx:dataProvider>
  <mx:columns>
   <mx:AdvancedDataGridColumn dataField="Album"/>
   <mx:AdvancedDataGridColumn dataField="Price" />
  </mx:columns>
 </mx:AdvancedDataGrid>
 
</mx:Application>
 }

 <mx:AdvancedDataGrid id="test" creationComplete="remove_watermark()">
  <mx:dataProvider>
   <mx:Object Artist="Jlo" Price="60" Album="enchanted"/>    
   <mx:Object Artist="Shakira" Price="90" Album="woddoo"/>  
  </mx:dataProvider>
  <mx:columns>
   <mx:AdvancedDataGridColumn dataField="Album"/>
   <mx:AdvancedDataGridColumn dataField="Price" />
  </mx:columns>
 </mx:AdvancedDataGrid>
 
</mx:Application>