title: View controller is drawing under my navigation bar after popping ttthumbsviewcontroller
body: <p>I'm implementing the TTThumbsViewController from the Three20 project and things are finally starting to take shape.  I push the TTThumbsViewController from the current view controller by just pushing it onto the current stack and animate the transition (common navigation controller push).  </p>
  
  <p>My problem is that when I pop the TThumbsViewController view controller, the navigation controller is stuck in a mode where its view controllers are drawn UNDER the navigation bar (which is now translucent).</p>
  
  <p><strong>Start</strong></p>
  
  <p><img src="https://people.engr.ncsu.edu/sbklein/start.PNG" alt="alt text"></p>
  
  <p><strong>Push</strong></p>
  
  <p><img src="https://people.engr.ncsu.edu/sbklein/push.PNG" alt="alt text"></p>
  
  <p><strong>Pop</strong></p>
  
  <p><img src="https://people.engr.ncsu.edu/sbklein/pop.PNG" alt="alt text"></p>