【DataGrid】重构有关问题

【DataGrid】重构问题
在网上看到这样的资料
<?xml version="1.0" encoding="utf-8"?> 
<mx:DataGrid xmlns:mx="http://www.adobe.com/2006/mxml"> 
<mx:Script> 
<![CDATA[ 
override protected function drawRowBackground(s:Sprite, rowIndex:int, y:Number, height:Number, color:uint, dataIndex:int):void 
{ 
var list:XMLList = new XMLList(dataProvider) 
if(dataIndex < list.length() && list[dataIndex].@result <60)color = 0xFF6600 
super.drawRowBackground(s,rowIndex,y,height,color,dataIndex); 
} 
]]> 
</mx:Script> 
</mx:DataGrid> 


而我的DataGrid是用arraycollection绑定的，所以override protected function drawRowBackground（）{。。。。应该如何写？}

以下是我写的可是报错
var array:Array = dataProvider as Array //ArrayCollection也不行
if(dataIndex < array.length && array[dataIndex].result >60)color = 0xFF6600 
super.drawRowBackground(s,rowIndex,y,height,color,dataIndex);

[解决办法]
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