title: Window oppened after double click on progress bar is immidiatly dragged into background
body: <p>I've got a non-dialog window, which opens after the user double-clicks on a progress bar.</p>
  
  <p>Each time it opens, it's briefly in the foreground, after which it is dragged into background (hidden behind the main application window, the one with the progress bar).</p>
  
  <p>I want for it to remain the top window, and I don't want to make it Topmost.</p>
  
  <p>How do I do this?</p>
  
  <p>I'm writing this in WPF 4 and c#</p>