Hot key not sent

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Windows

Hi,

I have set a hot key with:

RegisterHotKey(g_hWnd, g_iHotKeyID, HOTKEYF_ALT | HOTKEYF_CONTROL, 0x42);

The function returns not zero, so it is successful.

To the window proc for g_hWnd I added:

switch(msg)
{
...
   case WM_HOTKEY:
   {
     MessageBox(NULL, "HOT KEY PRESSED", "", 0);
     return TRUE;
   }
...
}

But I do not receive the message! Also Spy++ does not show the WM_HOTKEY message!

Can anybody give me a hint where to start searching?

What could be the problem? Does the window need to satisfy specific properties?

Regards,