title: navigationItem.title doesnt get refreshed
body: <p>I have a RootViewController and a SubViewController. I traverse the views in either direction. The RootViewController is a UITableView SubClass. Depending upon the row selected I want to change the title of the subview using <code>self.navigationItem.title = [chunks objectAtIndex:1];</code></p>
  
  <p>It works when the subview is first time loaded. But when I return to the RootViewController and load the subview again the previous title persists.
  Any ideas what am I missing out on?</p>