title: Windows Phone 8 & Phonegap: how to close app with back button
body: <p>I use phonegap to create Windows Phone 8 app</p>
  
  <p>Now, I'm done with everything but i can't exit the application with back button.<br>
  I had used navigator.app.exitApp(); but it's now working. 
  Does it work on Windows Phone?</p>
  
  <p>It's working on Android and Blackberry.</p>