title: Drill down QListWidget
body: <p>I can show a list of items in the QListWidget, and on click get the item selected. What I can't seem to figure out how to drill down the data (I don't want to use tree view).</p>
  <p>So as an example, the first list could be list of TV Shows. Clicking a show shows list of Seasons. Clicking a season shows the list of episodes.</p>
  <p>I can clear and add items back to the tree, but I want to retain the ability to go back to previous list.</p>
  <p>Would hide the top list, create new list, and add a back item element clicking which deletes the top level and shows the previous list?</p>