title: pygtk: cannot set parent on toplevel widget
body: <p>I'm working on a project that has a glade GUI.</p>
  
  <p>I need the main window to have 2 section, divided by a gtk.Hpaned widget (horizontal panes).</p>
  
  <p>The left pane would have a tool-bar like layout of buttons, maybe 3 or more.</p>
  
  <p>What I need is a way to create different windows and display them on the right pane of the main window. This way, when I click button 1, subwindow1 will appear in the right pane. Click button2, subwindow2 will appear on the right pane.</p>
  
  <p>Instead of having windows pop-up left and right, I want to reparent them to the right pane of this gtk.Hpaned widged.</p>
  
  <p>How do you do this in python with pygtk?</p>