How to hide itemRenderers in the Grouped rows of an AdvancedDataGrid?

Question

I am using an AdvancedDataGrid and showing a comboBox as the itemRenderer and also the editRenderer. However I am seeing the combobox in the grouped rows also. Below is the code I am using and also attached the screenshot of the app. Please help.
TestAdvGridGrpRen.mxml
===================
<?xml version="1.0"?>
<!-- dpcontrols/adg/SummaryGroupADGCustomSummary.mxml -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        <![CDATA[
            import mx.collections.ArrayCollection;
            import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn;
            import mx.collections.IViewCursor;   
            import mx.collections.SummaryObject;
[Bindable]
private var dpFlat:ArrayCollection = new ArrayCollection([
  {Region:"Southwest", Territory:"Arizona",
      Territory_Rep:"Barbara Jennings", Actual:38865, Estimate:40000},
  {Region:"Southwest", Territory:"Arizona",
      Territory_Rep:"Dana Binn", Actual:29885, Estimate:30000},
  {Region:"Southwest", Territory:"Central California",
      Territory_Rep:"Joe Smith", Actual:29134, Estimate:30000},
  {Region:"Southwest", Territory:"Nevada",
      Territory_Rep:"Bethany Pittman", Actual:52888, Estimate:45000},
  {Region:"Southwest", Territory:"Northern California",
      Territory_Rep:"Lauren Ipsum", Actual:38805, Estimate:40000},
  {Region:"Southwest", Territory:"Northern California",
      Territory_Rep:"T.R. Smith", Actual:55498, Estimate:40000},
  {Region:"Southwest", Territory:"Southern California",
      Territory_Rep:"Alice Treu", Actual:44985, Estimate:45000},
  {Region:"Southwest", Territory:"Southern California",
      Territory_Rep:"Jane Grove", Actual:44913, Estimate:45000}
            // Callback function to create
            // the SummaryObject used to hold the summary data.
            private function summObjFunc():SummaryObject {
                // Define the object containing the summary data.
                var obj:SummaryObject = new SummaryObject();
                // Add a field containing a value for the Territory_Rep column.
                obj.Territory_Rep = "Alternating Reps";
                return obj;
            // Callback function to summarizes
            // every other row of the Actual sales revenue for the territory.
            private function summFunc(cursor:IViewCursor, dataField:String,
                operation:String):Number {
                var oddCount:Number = 0;
                var count:int = 1;
                while (!cursor.afterLast)
                    if (count % 2 != 0)
                        oddCount += cursor.current["Actual"];
                    cursor.moveNext();
                    count++;
                return oddCount;
      ]]>
    </mx:Script>
    <mx:AdvancedDataGrid id="myADG"
        width="100%" height="100%"
        initialize="gc.refresh();">      
        <mx:dataProvider>
            <mx:GroupingCollection id="gc" source="{dpFlat}">
                <mx:Grouping>
                   <mx:GroupingField name="Region"/>
                   <mx:GroupingField name="Territory">
                      <mx:summaries>
                         <mx:SummaryRow summaryObjectFunction="summObjFunc"
                            summaryPlacement="first">
                            <mx:fields>
                               <mx:SummaryField dataField="Actual" summaryFunction="summFunc"/>
                            </mx:fields>
                         </mx:SummaryRow>
                      </mx:summaries>
                   </mx:GroupingField>
                </mx:Grouping>
            </mx:GroupingCollection>
        </mx:dataProvider>      
        <mx:columns>
            <mx:AdvancedDataGridColumn dataField="Region"/>
            <mx:AdvancedDataGridColumn dataField="Territory_Rep"
                headerText="Territory Rep"/>
            <mx:AdvancedDataGridColumn headerText="Actual" dataField="Actual"
            rendererIsEditor="true"
            itemRenderer="TestStatusTypeEditor"
            editorDataField="type"/>
            <mx:AdvancedDataGridColumn dataField="Estimate"/>
        </mx:columns>
   </mx:AdvancedDataGrid>
</mx:Application>
TestStatusTypeEditor.mxml
====================
<?xml version="1.0" encoding="utf-8"?>
<mx:ComboBox xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="OnInit()" >
<!-- This is the content of the ComboBox.
<mx:dataProvider>
<mx:Object label="Cog" />
<mx:Object label="Sproket" />
</mx:dataProvider>
-->
<mx:Script>
<![CDATA[
import mx.collections.ArrayCollection;
        [Bindable]
        public var cards:ArrayCollection = new ArrayCollection(
            [ {label:"38865", data:1},
              {label:"29885", data:2},
              {label:"29134", data:3},
              {label:"52888", data:4},
              {label:"38805", data:5},
              {label:"55498", data:6},
              {label:"44985", data:7},
              {label:"44913", data:8}]);
private function OnInit():void
dataProvider = cards;
* This override of set data compares the data.label against the label property
* of each item in the dataProvider (above). This code is written a bit more
* generically than necessary, but it would allow you to have a long list
* in the dataProvider and not have to change this code.
override public function set data(value:Object):void
super.data = value;
var list:ArrayCollection = dataProvider as ArrayCollection;
for(var i:int=0; i < list.length; i++)
if( String(value.statusName) == list[i].label ) {
selectedIndex = i;
* This getter is the one identified as the editorDataField in the list for
* the itemEditor.
public function get type() : String
if( selectedItem ) {
return selectedItem.label;
else {
return null;
]]>
</mx:Script>
</mx:ComboBox>

Answer 1

Solved this issue by using mx:rendererProviders element for my AdvancedGrid. Using the depth parameter gives me the ability to hide the itemRenderer for the Grouped rows.
    <mx:AdvancedDataGrid id="myADG"
        width="100%" height="100%"
        initialize="gc.refresh();">       
        <mx:dataProvider>
            <mx:GroupingCollection id="gc" source="{dpFlat}">
                <mx:Grouping>
                   <mx:GroupingField name="Region"/>
                   <mx:GroupingField name="Territory">
                      <mx:summaries>
                         <mx:SummaryRow summaryObjectFunction="summObjFunc"
                            summaryPlacement="first">
                            <mx:fields>
                               <mx:SummaryField dataField="Actual" summaryFunction="summFunc"/>
                            </mx:fields>
                         </mx:SummaryRow>
                      </mx:summaries>
                   </mx:GroupingField>
                </mx:Grouping>
            </mx:GroupingCollection>
        </mx:dataProvider>       
        <mx:columns>
            <mx:AdvancedDataGridColumn dataField="Region"/>
            <mx:AdvancedDataGridColumn dataField="Territory_Rep"
                headerText="Territory Rep"/>
            <mx:AdvancedDataGridColumn headerText="Actual" dataField="Actual"
            rendererIsEditor="true"
            editorDataField="type"/>
            <mx:AdvancedDataGridColumn dataField="Estimate"/>
        </mx:columns>
<mx:rendererProviders>
    <mx:AdvancedDataGridRendererProvider
        columnIndex="2"
        columnSpan="1"
        depth="3"
        renderer="TestStatusTypeEditor"/>
</mx:rendererProviders>
   </mx:AdvancedDataGrid>