for non MFC extension DLls same problem....

 

 

Anyway. for 10.4 release we replace method from PreTranslateMessage to OnWndMsg to be sure it will call fro ActicveX/ simple DLL contexts. please patch your sources.

 

BOOL CXTColorPicker::OnWndMsg(UINT message, WPARAM wParam, LPARAM lParam, LRESULT* pResult)
{
 if (!m_bPopupActive)
 {
  if (message == WM_LBUTTONDOWN)
  {
   ShowPopupWindow();
   // in this case the message is not "swallowed" so the button will
   // get it and display itself in a recessed state
  }
  else if (message == WM_KEYDOWN &&
   (wParam == VK_RETURN ||
   wParam == VK_SPACE ||
   wParam == VK_DOWN))
  {
   ShowPopupWindow();
   return TRUE;  // swallow message
  }
 }

 return CXTButton::OnWndMsg(message, wParam, lParam, pResult);
}

if you use it in ActiveX context, then it is expected behaviour.