title: WordAddIn get document handle
body: <p>I need to get the <code>Win32Window</code> (Handle) of the current active Document.</p>
  <p>This is what I am currently using:</p>
  <pre><code>NativeWindow Win32Parent = new NativeWindow()
                           .AssignHandle(Process.GetCurrentProcess().MainWindowHandle);
  </code></pre>
  <p>this works, but because of this piece of code Word does restart every time after I close it.</p>