title: Do something after navigate to another page
body: <p>I'm developing a Windows Phone 7 app.</p>
  
  <p>I want to do something after doing this:</p>
  
  <pre><code>NavigationService.Navigate(new Uri(destination, UriKind.Relative));
  </code></pre>
  
  <p>Is there any event thrown when a page has navigated to another page?</p>