public void Activate()
        {
            Console.WriteLine($"@@@ this.GetType().Name={this.GetType().Name}, Activate()");

            window    = NUIApplication.GetDefaultWindow();
            page      = new LayoutAddRemoveTest2Page();
            navigator = window.GetDefaultNavigator();

            navigator.Push(page);
        }
 public void Deactivate()
 {
     Console.WriteLine($"@@@ this.GetType().Name={this.GetType().Name}, Deactivate()");
     navigator.Pop();
     page = null;
 }