It depends how you define "Change".  A lot of things can cause change. 

 If you want to know the data changes, look at the dataChange event. 

markflex2007 wrote:
> 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>
>
>
>
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