title: Handling backbutton on Windows Phone 10 app C#
body: <p>I'm searching from a while and I can't find how to handle the back button..
  I saw a lot of examples and no one of them perform..</p>
  
  <p>I'm trying to make an app with two pages and then, I wanna use the back button to goBack on the first page. I make an universal app with Visual Studio 2015 and I didn't find an SDK for Visual Studio 2015 Windows Phone, so maybe it would be better to have an SDK, maybe my error came from here?</p>
  
  <p>Thank for your read and your futur answers</p>