title: UWP Prism NavigationService configuration
body: <p>I've started a UWP project with Prism Library. To navigate between pages I'm using Prism NavigationService. Well everything is ok while I have situation as in bellow image:
  <a href="https://i.stack.imgur.com/m2a6Q.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/m2a6Q.png" alt="application start flow"></a></p>
  
  <p>Well after login I need to load a window with a split view and later to use NavigationService to change only content of the "red square". </p>
  
  <p><a href="https://i.stack.imgur.com/4U3vm.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4U3vm.png" alt="later application flow "></a></p>
  
  <p>My third page xaml looks like:</p>
  
  <pre><code> &lt;SplitView x:Name="rootSplitView" Style="{StaticResource MenuSplitViewStyle}" Grid.Row="1"&gt;
              &lt;Frame x:Name="contentFrame"/&gt;
  
              &lt;SplitView.Pane&gt;
                  &lt;views:MenuViewPage/&gt;
              &lt;/SplitView.Pane&gt;
          &lt;/SplitView&gt;
          &lt;ToggleButton x:Name="togglePaneButton"
                        VerticalAlignment="Center"
                        IsChecked="{Binding IsPaneOpen,
                                            ElementName=rootSplitView,
                                            Mode=TwoWay}"
                        Style="{StaticResource SplitViewTogglePaneButtonStyle}"
                        TabIndex="1" /&gt;
  </code></pre>
  
  <p>My app bootstrap is:</p>
  
  <pre><code>public sealed partial class App : PrismUnityApplication
  {
      protected override Task OnLaunchApplicationAsync(LaunchActivatedEventArgs args) 
          {
  
              if (args != null &amp;&amp; !string.IsNullOrEmpty(args.Arguments))
              {
                  // The app was launched from a Secondary Tile
                  // Navigate to the item's page
                  //NavigationService.Navigate("ItemDetail", args.Arguments);
              }
              else
              {
                  // Navigate to the initial page
                  NavigationService.Navigate(PageTokens.IntroPage, null);
              }
  
              Window.Current.Activate();
              return Task.FromResult&lt;object&gt;(null);
          }
  ...
  }
  </code></pre>
  
  <p>My question is how I can create a region in red square and configure navigation service to use the region to navigate between pages. </p>