title: Tab bar item third touch for a table view not scrolling to the top
body: <p>I have a tab bar item which is connected navigation controller with a UIViewController as the root view controller. The first touch on the tab bar item switches to that view. The second touch pops to the root view controller. The third touch does <strong>not</strong> scroll to the top.</p>
  
  <p>I've seen this scroll-to-top behavior in other apps, but after searching the webs, I cannot find out anything about it.</p>
  
  <p>Is this default behavior for scroll views or table views attached to tab bar items, or is it something I need to implement myself?</p>