Limiting the Docking Stickers

I need some help in restricting the number of docking stickers which appear on the screen. In my current implementation of docking panes I have used the functions:

 m_paneManager.SetAlphaDockingContext(TRUE);
 m_paneManager.SetShowDockingContextStickers(TRUE);
 m_paneManager.SetDefaultPaneOptions(xtpPaneHasMenuButt on);

This creates the four sets of sticker which represent top,bottom,left and right. I have implementted a function to restrict docking to the left and right edges of the frame. Is there anyway to only diisplay the left and right sitckers when dragging a docking pane.

thanks