title: The COM control can't display in a custom WPF window
body: <p>Now I can use a COM control and display it in a WPF window.</p>
  
  <p>I developed a custom WPF window for better UI.</p>
  
  <p>When I put a COM control into the custom WPF window, sad event happened. The COM control didn't display and didn't throw a exception.</p>
  
  <p>Could anybody give me a road to find the reason? Thanks very much.</p>