Want to implent CheckBox for itemRenderer and headerItemRenderer for spark DataGrid.

I am using mx:DataGrid in my application.
The first column itemRenderer and headerItermRenderer is CheckBox.
Now I want to move it to spark DataGrid. I could imprement itermRenderer easily by creating sub-claassing GridItemRenderer. But I am struck at implementing headerItermRenderer. I tried to implent it using GridItemRenderer sub-class as I did with itemRenderer. It is not working. The set data method is not getting called.
Do anyone have code for implenting checkbox as itemRenderer and headerRendere in spark datagrid (and not mx datagrid)?
Thanks,
Prithvee Zankat.

Hi,
Item renderer can be implemented for spark and i think you will have to write custom header renderer. I am providing some useful links,please go through them :
http://help.adobe.com/en_US/flex/using/WS0ab2a460655f2dc3-427f401412c60d04dca-7ff3.html
http://cookbooks.adobe.com/post_3_state_checkbox_for_header_renderer_in_datagrid-18900.htm l
http://blogs.adobe.com/aharui/category/item-renderers
http://boardreader.com/thread/Spark_Datagrid_custom_header_renderer_1zw07Xgoeo.html
Thanks and Regards,
Vibhuti Gosavi | [email protected] | www.infocepts.com

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Here is my combobox:
package
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    import mx.controls.listClasses.IDropInListItemRenderer;
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and here is the implementation:
var PersonnelPerson:ClassFactory = new ClassFactory(sparkComboRendererDataGrid);
PersonnelPerson.properties = {labelField : "person", dataProvider :
new XMLListCollection(dataList.consistcrew)};
var col:GridColumn = GridColumn(personnel.columns.getItemAt(0));
col.itemRenderer = PersonnelPerson;
Please help.
Thanks

Actually, after adding the following code it started working:
import spark.skins.spark.DropDownListSkin;
override public function stylesInitialized():void
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