title: Refreshing PivotItem's DataContext on WP8
body: <p>I'm working on an image viewer that displays images inside a pivo control (mainly gifs downloaded from the internet). I'd like to make it an "endless" pivot. For that I used 3 PivotItems where the active item contains the current image and the other two contain the next and the previous one based on this idea:</p>
  
  <p><a href="https://stackoverflow.com/questions/5146960/endless-pivot-control">Endless Pivot control</a></p>
  
  <p>On each SelectionChanged event I want update the pages. But how would you update the datacontexts of the PivotItems. I can't access them from the codebehind, I can only access the Pivot.</p>