title: MFC OnMouseActivate: Where is focus if you eat the mouse event?
body: <p>Where does focus remain?
  Is focus left on the window that previously held focus, or is focus in limbo, on no window?</p>
  
  <p>I've noticed that when I eat a message, it appears as if nothing has focus.</p>
  
  <p>I return MA_NOACTIVATEANDEAT</p>