c++ - SendMessage (F4) fails when sending it to window -

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Working with Visual Studio 6 (VC ++ 6.0) I am using an ActiveX datekeeper control which I failed to show extended by default (). Alternatively, I'm trying to send a keyboard message (F4) in my window to open the control, but nothing happens ... 

  // try 1 : Standard Use Window Handle LRESULT = Result Message (m_hWnd, VK_F4, 0, 0); // Try 2: Use only SendMessage results = SendMessage (VK_F4);

The result is always 0 - What can I do to send / test messages?

Thank you in a lot of profits ...

Oli

< P> VK_F4 is a key code, window message is not tried: 

  :: Send message (m_hWnd, WM_KEYDOWN, VK_F4, 0); :: SendMessage (M_Handund, WM_KEEUUUP, VK_F4, 0);

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