FWIW I have looked at CXTPDockingPaneAutoHidePanel::OnLButtonDown and changed the logic so that clicking on the tab of a selected pane which has focus results in the pane being closed, this way I have acheived what I want.

void CXTPDockingPaneAutoHidePanel::OnLButtonDown(UINT /*nFlags*/, CPoint point)
{
 CXTPDockingPane* pPane = HitTest(point);
 if (pPane)
 {
  if (m_pActiveWnd && m_pActiveWnd->m_pPane->GetSelected() == pPane)
  {
#pragma message ("*** OnLButtonDown changed ++" __FILE__)
   //
   // New - if focus then hide.
   //
   if (pPane->IsFocus())
   {
    CloseActiveWindow();
    KillTimer(TID_SLIDEIN);
   }
   else
    pPane->SetFocus();

   //
   // Original.
   //
   // pPane->SetFocus();
#pragma message ("*** OnLButtonDown changed --" __FILE__)

  } else
  {
   CloseActiveWindow();
   ShowPane(pPane);
  }
 }
}

Imagine a standard MDI application with a single docking window where the docking window (the CodeJock calendar) is displayed and selected:

The question: as the calendar is active, what should you user do to hide it? I've not really come up with a good solution other than:

* Add a button next to the pin to hide (not [X] close) the window.
* If you click on the title bar (where the calendar text and pin is displayed) then the window should hide itself.

But what's the advice from those who know? Clicking in the MDI views is not an option.

Thanks for the excellent software,