Flex DataGrid中列绑定ComboBox

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
 <mx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            public var datas:ArrayCollection = new ArrayCollection([1,2,3,4]);
            private var gridDatas:ArrayCollection = new ArrayCollection([
                {col1:1,col2:2,col3:3},
                {col1:1,col2:2,col3:3},
                {col1:1,col2:2,col3:3}
            ]);
        ]]>
    </mx:Script>
    <mx:DataGrid x="89" y="111" width="350" height="145" dataProvider="{gridDatas}">
        <mx:columns>
            <mx:DataGridColumn headerText="Column 1" dataField="col1"/>
            <mx:DataGridColumn headerText="Column 2" dataField="col2"/>
            <mx:DataGridColumn headerText="Column 3" dataField="col3">
                <mx:itemRenderer>
                    <mx:Component>
                        <mx:ComboBox dataProvider="{outerDocument.datas}"/>
                    </mx:Component>
                </mx:itemRenderer>
            </mx:DataGridColumn>
        </mx:columns>
    </mx:DataGrid>
</mx:Application>

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