title: scrollsToTop not working
body: <p>I have the following object structure:</p>
  
  <ul>
  <li>UITabBarController
  
  <ul>
  <li>UINavigationController
  
  <ul>
  <li>UITableViewController</li>
  </ul></li>
  </ul></li>
  </ul>
  
  <p>It used to work, but then I added the UITabBarController into the mix and made a bunch of other large changes and somewhere in between it stopped.</p>
  
  <p>So far I have:</p>
  
  <ul>
  <li>created a new project with that structure, and that seems to work OK.</li>
  <li>checked that there's only one view with scrollsToTop</li>
  <li>tried adding a new UITableViewController directly under UITabBarController... still doesn't work.</li>
  </ul>
  
  <p>One thing that might be of use is that <code>-scrollViewShouldScrollToTop:</code> isn't even being called, even though the table view controller's <code>tableView.delegate</code> is set to the controller.</p>