title: How to get the source Page in OnNavigatedTo method WP 8.1
body: <p>Navigating to a Frame, when I get on it, I would like to get the name of the source page that I'm coming from in order to execute specific actions depending of the navigation source frame. I've heard that the method to use is <strong><em>OnNavigatedTo</em></strong> by can't figure out how to get the source page...
  Does anyone knows something about that ? 
  Thanks in advance !</p>