改变DataGrid单元格颜色

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======== CustomBackgroundComp.as ===========
package {
    import mx.controls.Label;
    import mx.controls.DataGrid;
    import mx.controls.dataGridClasses.*;
    import flash.display.Graphics;

    public class CustomBackgroundComp extends Label {

        override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
        {
            super.updateDisplayList(unscaledWidth, unscaledHeight);
            var g:Graphics = graphics;
            g.clear();
            var grid1:DataGrid = DataGrid(DataGridListData(listData).owner);
            if (grid1.isItemSelected(data) || grid1.isItemHighlighted(data))
                return;
            if (data[DataGridListData(listData).dataField] > 100)
            {
                g.beginFill(0xFF0033);
                g.drawRect(0, 0, unscaledWidth, unscaledHeight); g.endFill();
            }
        }
    }
}

// ======== Main.mxml ===========
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" width="600" height="600" xmlns="*" creationComplete="srv.send();" >

<mx:Script>
   import mx.collections.ArrayCollection;
   import mx.rpc.events.*;

   public var rowData : ArrayCollection;

   private function resultHandler(event: ResultEvent) : void
   {
rowData = event.result.coordinates.values;
myDatagrid.dataProvider = rowData;
   }

</mx:Script>
<mx:HTTPService id="srv" url="coordinateValues.xml" useProxy="false" result="resultHandler(event)"/>

<mx:DataGrid id="myDatagrid" width="300" height="300">
     <mx:columns>
<mx:Array>
    <mx:DataGridColumn dataField="xval" headerText="x value" itemRenderer="CustomBackgroundComp"/>
    <mx:DataGridColumn itemRenderer="CustomBackgroundComp" headerText="y value" dataField="yval" />
</mx:Array>
     </mx:columns>
   </mx:DataGrid>

</mx:Application>

//====== coordinateValues.xml ============
<?xml version="1.0" encoding="utf-8"?>
    <coordinates>
      <values xval="51" yval="54" />
      <values xval="142" yval="225" />
      <values xval="3" yval="148" />
      <values xval="254" yval="13" />
      <values xval="785" yval="18" />
      <values xval="46" yval="61" />
      <values xval="117" yval="183" />
      <values xval="8" yval="111" />
    </coordinates>