问AdvancedDataGrid中的按钮

EN

<mx:AdvancedDataGrid id="ad" creationComplete="create();">
    <mx:columns>
        <mx:AdvancedDataGridColumn dataField="text"/>
        <mx:AdvancedDataGridColumn>
            <mx:itemRenderer>
                <mx:Component>
                    <mx:Button label="{data.buttonLabel}" 
                        click="{outerDocument.onClick(data)}"/>
                </mx:Component>
            </mx:itemRenderer>
        </mx:AdvancedDataGridColumn>
    </mx:columns>
</mx:AdvancedDataGrid>

public function create():void
{
    var array:Array = [{text:"Text1", buttonLabel:"Bt1"},
                    {text:"Text2", buttonLabel:"Bt2"}]
    ad.dataProvider = new ArrayCollection(array);
}
public function onClick(item:Object):void
{
    trace(item.text);
}