title: UWP Page navigation indentifier
body: <p>Hello in UWP I can navigate to another page like:</p>
  
  <pre><code>Frame.Navigate(typeof(AnotherPage), someObject);
  </code></pre>
  
  <p>and in <code>AnotherPage</code> if I want to retrieve the object:</p>
  
  <pre><code>protected override void OnNavigationTo(NavigationEventArgs e) {
      SomeObject someObject = (SomeObject) e.Parameter;
      //here I would like to know from what page I am navigating
  }
  </code></pre>
  
  <p>Could you tell me how to find out from what page am I navigating? Thanks.</p>