title: Virtual keyboard on Top
body: <p>We are going to create a virtual keyboard (on screen keyboard) with customized keys (no Ctrl, Alt and ...). 
  The problem is when we set the application to be <code>Topmost="Ture"</code> then it is not possible to find the last active application's window to send the selected key to it. (The keyboard application is now the active one.)
  We did a few search but couldn't find anything helpful.</p>