How to make AdvancedDataGridColumn header to be invisible?

Hi,
I have a requirement to group a bunch of columns under a common header but don't want to show the headers for the child columns in the group.
The code snippet is below
<mx:AdvancedDataGrid >
<mx:AdvancedDataGridColumnGroup headerText="Heatmap Thresholds" width="480" sortable="false" >
      <mx:AdvancedDataGridColumn editable="false" dataField="Threshold1" headerText="" sortable="false" />
      <mx:AdvancedDataGridColumn editable="false" dataField="Threshold2" headerText="" sortable="false" />
      <mx:AdvancedDataGridColumn editable="false" dataField="Threshold3" headerText="" sortable="false" />
</mx:AdvancedDataGridColumnGroup>
<mx:AdvancedDataGrid >
If I run this code I get three sub headers for Threshold1, Threshold2 and Threshold3 without any text but at the end I still see 3 blank headers which I don't want to show.
So I tried to apply a headerHeight style to each of these childcolumns but it didnt work.
Then I even tried adding an AdvancedDataGridHeaderRenderer and setting the height property to 0, 0%, -1 and all other combinations but the subheaders were still visible.
<mx:AdvancedDataGridColumn editable="false" dataField="Threshold1" headerText="" sortable="false">
<mx:headerRenderer>
<fx:Component>
   <mx:AdvancedDataGridHeaderRenderer height="0%"/>
</fx:Component>
</mx:headerRenderer>
</mx:AdvancedDataGridColumn >
Can someone advise how to hide the headers for the child columns in ColumnGroup mentioned above?
Thanks
Ravisekhar Kopparthi

yourTree.setCellRenderer(new yourTreeCellRenderer());Also, see Q6.2 of this FAQ:
http://www.cs.uu.nl/wais/html/na-dir/computer-lang/java/gui/faq.html

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