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I derived my class from CExtControlBar and process mouse as U do at MDI sampe. But, The message can’t handled at my code, why? below are part of my class :

class CMyPreviewBar : public CExtControlBar
{
 class CMyPreviewWnd : public CExtWRB<CBitmapPicture>
 {
 private:
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
  {
   switch (message)
   {
   case WM_CONTEXTMENU:
    return 0;

   case WM_LBUTTONDOWN :
    AfxMessageBox("Btn Down");
   }
   return CExtWRB<CBitmapPicture>::WindowProc(message, wParam, lParam);
  }
 }; // class CMyPreviewWnd

 CMyPreviewWnd m_wndTaskArea;

It seems the CMyPreviewBar::CMyPreviewWnd class handles mouse events correctly. Please make sure you have specified the CMyPreviewBar window as its parent window. Please also check whether the CMyPreviewBar::CMyPreviewWnd window is enabled -- this is essential for receiving mouse click events. You can also send us your project and we will fix the problem.

Thank you.

I did it. CMyPreviewWnd is derived from CStatic. So, I added SS_NOTIFY style constant at Create(...) call.

In this case we have no more questions and need to take a look at your project. Could you send it to us or any other project that demonstrates the problem?