Hide and Select Pane Crashes

The code below causes our application to crash. I've tried a few variations of the code such as hiding and showing the pane by calling CXTPDockingPaneManager::HidePane() and CXTPDockingPaneManager::ShowPane(). Can someone help me resolve this problem? Thanks.

---CODE------------------------------------

LRESULT CCustomJobFrame::OnToggleViewCustomJobItems( WPARAM wParam, LPARAM lParam )
{
 CXTPDockingPane *pDockingPane = m_paneManager.FindPane( IDR_CUSTOMJOBITEMDATA );

 if( pDockingPane != NULL )
 {
  if( pDockingPane->IsHidden() )
  {
   pDockingPane->Select();
  }
  else
  {
   pDockingPane->Hide();
  }
 }
 return 0;
}

---CALLSTACK---------------------------------

CWnd::Invalidate(int 0) line 126 + 43 bytes
CXTPDockingPaneAutoHidePanel::ShowPane(CXTPDockingPane * 0x0214f938 {CXTPDockingPane}, int 1) line 817
CXTPDockingPaneTabbedContainer::Show() line 720
CXTPDockingPaneManager::ShowPane(CXTPDockingPane * 0x0214f938 {CXTPDockingPane}) line 587
CXTPDockingPane::Select() line 154
CCustomJobFrame::OnToggleViewCustomJobItems(unsigned int 192, long 2686977) line 290 + 11 bytes
CWnd::OnWndMsg(unsigned int 1575, unsigned int 192, long 2686977, long * 0x0012f8a8) line 1815 + 17 bytes
CWnd::WindowProc(unsigned int 1575, unsigned int 192, long 2686977) line 1585 + 30 bytes
AfxCallWndProc(CWnd * 0x02112018, HWND__ * 0x015409c8, unsigned int 1575, unsigned int 192, long 2686977) line 215 + 26 bytes
AfxWndProc(HWND__ * 0x015409c8, unsigned int 1575, unsigned int 192, long 2686977) line 368
AfxWndProcBase(HWND__ * 0x015409c8, unsigned int 1575, unsigned int 192, long 2686977) line 220 + 21 bytes
USER32! 77d48709()
USER32! 77d487eb()
USER32! 77d4c00e()
USER32! 77d4e366()
CXTPHookManager::HookWndProc(HWND__ * 0x015409c8, unsigned int 1575, unsigned int 192, long 2686977) line 101 + 28 bytes

---CRASHES HERE----------------------------

void CXTPDockingPaneAutoHidePanel::ShowPane(CXTPDockingPane* pPane, BOOL bSetFocus)
{
...
 Invalidate(FALSE);
...
}

_AFXWIN_INLINE void CWnd::Invalidate(BOOL bErase)
 { ASSERT(::IsWindow(m_hWnd)); ::InvalidateRect(m_hWnd, NULL, bErase); }

m_hWnd = NULL

Thought 1 isnt possible because the panes are created and visible.

Thought 2 worked.

Thanks.

LRESULT CCustomJobFrame::OnToggleViewCustomJobItems( WPARAM wParam, LPARAM lParam )
{
 RecalcLayout();

 CXTPDockingPane *pDockingPane = m_paneManager.FindPane( IDR_JOBITEM );

 if( pDockingPane != NULL )
 {
  if( !pDockingPane->IsFloating() )
  {
   if( pDockingPane->IsHidden() )
   {
    pDockingPane->Select();
   }
   else
   {
    pDockingPane->Hide();
   }
  }
 }
 return 0;
}

This was our work-around for the GetPaneDirection() problem:

LRESULT CCustomJobFrame::OnToggleViewCustomJobItems( WPARAM wParam, LPARAM lParam )
{
 RecalcLayout();
  ...
 CXTPDockingPane *pDockingPane = m_paneManager.FindPane( IDR_JOBITEM );
 if( pDockingPane != NULL )
 {
  if( pDockingPane->IsHidden() || bForceShow == TRUE )
  {
   CRect rc(-100, -100, -150, -150 );
   m_paneManager.FloatPane( pDockingPane, rc );
   m_paneManager.ToggleDocking( pDockingPane );
  }
  else
  {
   pDockingPane->Hide();
   ...
  }
 }
 return 0;
}

Thanks!