[flexcoders] How to check the itemRender change?

[markflex2007]

Hi,

I have a checkbox itemRender in datagrid. I want to know if the itemRender 
changed.which event I can use to do that.

I use "change" but it doesn't work.Please help me

Thanks


Mark


<mx:DataGrid id="dgGroupingSetup" dataProvider="{myData}" width="100%" 
editable="true" height="200" change="Alert.show('change')">
                <mx:columns>
                        <mx:DataGridColumn id="groupID" headerText="Group ID" 
dataField="groupID" editable="false" width="60"/>
                        <mx:DataGridColumn id="groupOwner" headerText="Group 
Owner" dataField="groupOwner" 
itemRenderer="ItemRenderers.GenericCheckboxRenderer"  editable="true" 
rendererIsEditor="true" editorDataField="selected" width="85"/>                 
        
                </mx:columns>
</mx:DataGrid>