title: How to make a UIBarButtonItem look like a UINavigationBarItem
body: <p>I have an iPad application with screen flows which don't map neatly to the navigation controller model, but still have the concept of "Back".</p>
  
  <p>I'd like to manage my own toolbar and have a "Back" button where I decide where it goes.</p>
  
  <p>Is there a way to make a toolbar button have the look of a back button as in UINavigationBarItem?</p>
  
  <p>Thanks</p>