Control for getting hotkeys like tab and space

LRESULT CALLBACK MessageHook(int code, WPARAM wParam, LPMSG lpMsg)
    {
      LRESULT lResult = 0;

      if ((code >= 0) && (code == MSGF_DIALOGBOX))
      {
        if (lpMsg->message == WM_KEYDOWN)
        {
          //-- process the key down message
          lResult = 1;
        }
      }

      // do default processing if required
      if (lResult == 0)
      {
        lResult = CallNextHookEx(MessageFilterHook, code, wParam, (LPARAM)lpMsg);
      }

      return lResult;
    }

//-- create an instance thunk for our hook callback
    FARPROC FilterProc = (FARPROC) MakeProcInstance((HOOKPROC)(MessageHook),
                                                    hInstance);
    //-- attach the message hook
    FilterHook = SetWindowsHookEx(WH_MSGFILTER,
                                 (HOOKPROC)FilterProc,
                                  hInstance, GetCurrentThreadId());

//-- remove a message hook
    UnhookWindowsHookEx(MessageFilterHook);