_window = new UIWindow(UIScreen.MainScreen.Bounds);
 _window.RootViewController = new ContainerView();

public override void ViewDidLoad ()
{
    base.ViewDidLoad ();
    NavigationController.NavigationBarHidden = false;
        var loginView = this.CreateViewControllerFor(ContainerModel.Login) as UIViewController;

        _navController = new UINavigationController(loginView);
        _navController.SetNavigationBarHidden(true, false);
        _navController.Delegate = new NavDelegate(navBar);

            containerView.AddSubview(_navController.View);

- nav controller view
  - container view
    - nav controller view (hide/show nav bar as necessary)
      - content