CDockablePane questions

[TubularX]

OK, I see how it's supposed to work. I also read here: http://msdn.microsoft.com/en-us/magazine/cc301402.aspx, where it says "If the mouse is in the left or right border, the default proc returns HTLEFT or HTRIGHT, respectively. These codes tell Windows to begin its moving or sizing chores. You can prevent moving and sizing by overriding ON_NCHITTEST."

However, it doesn't work as expected with CDockablePane. My code:

LRESULT CDialogBarEx::OnNcHitTest(CPoint point)
{	
          LRESULT res = CDockablePane::OnNcHitTest(point);
          if( res == HTLEFT || res == HTRIGHT )
               res = HTBORDER;
          return res;
}

If I set a breakpoint inside this method, it doesn't hit until the cursor is inside the pane borders, and the only result ever returned is HTCLIENT. So, when hovering over the border where the resize cursor appears, the NCHITTEST message is handled somewhere else?