title: CMFCMenuButton not showing dropdownlist in release
body: <p>I have a CMFCMenuButton on a CDialogBar that has a very strange behaviour: it shows its dropdown list in the Debug build but does not show it in the Release build.</p>
  
  <p>Debug build:</p>
  
  <p><img src="https://i.stack.imgur.com/xcLRC.png" alt="enter image description here"></p>
  
  <p>Release build:</p>
  
  <p><img src="https://i.stack.imgur.com/yzQQV.png" alt="enter image description here"></p>
  
  <p>It seems that there is happening something wrong in the call of __super::OnShowMenu() of the OnShowMenu() method of my derived class.</p>
  
  <p>To make thing worse, there is some configuration on my machine that is not stepping into the MFC feature pack methods ... I made everything to put this working and I could not get there.</p>
  
  <p>Please help.</p>