title: has uitabbarcontroller changed in xcode 4
body: <p>I recently upgraded to xcode 4.  My application utilizes tabbarcontroller.  In old xcode 3.x, you were able to change the tabs to different types per this screenshot:</p>
  
  <p><img src="https://i.stack.imgur.com/1vGid.png" alt="enter image description here"></p>
  
  <p>From what I gather in researching this issue, xcode 4 no longer offers this functionality.  Am I missing something?  From what I researched we are now suppose to delete/add tabs then change attributes to get the desired effect.  So, to that end in xcode 4, I've added a new tab item and made the class a UINavigationController fully expecting the ability to toggle the "Shows Navigation Bar" with a checkbox.  But, the "Navigation Controller" grouping never appears.  What am I missing?</p>
  
  <p>Thanks for your help.</p>