title: gtk.ListStore / gtk.TreeModel and dict type
body: <p>I've a dictionary (dict type) which I would store in a <code>gtk.ListStore</code>.</p>
  
  <p>Is there a way to do this ? (Which column type is good for that ?) or do I have to add as many columns in the <code>gtk.ListStore</code> as there are elements in the dictionary?</p>
  
  <p>Thanks</p>