public FrameCommandsPage()
        {
            this.InitializeComponent();

            // fill the targetframe backstack
            TargetFrame.Navigate(typeof(Page3));
            TargetFrame.BackStack.Add(new PageStackEntry(typeof(Page1), null, null));
            TargetFrame.BackStack.Add(new PageStackEntry(typeof(Page2), null, null));
        }
 public static void OpenPage(Page page)
 {
     TargetFrame.Navigate(page);
 }