title: Multi-Window GUI using Python Traits
body: <p>How can I create two windows using Python traits? Something like</p>
  
  <pre><code>if __name__ == '__main__':
      main_gui = MainGUI()
      user_input = UserInput()
  
      main_gui.configure_traits()
      user_input.configure_traits()
  </code></pre>
  
  <p>The issue here is that user_input.configure_traits isn't called until main_gui is closed, but since I'd like to have interaction between the two windows this obviously won't do. Is there perhaps a way to mimic a 'close' function within MainGUI and UserInput without actually closing the window, so that the main body of the code can move on? Thanks!</p>