public override void Show(MvxViewModelRequest request)
        {
            var viewModelLoader = Mvx.Resolve <IMvxViewModelLoader>();
            var viewModel       = viewModelLoader.LoadViewModel(request, null);

            if (request.ViewModelType == typeof(FormsViewModel))
            {
                var page = new TestPage
                {
                    BindingContext = viewModel
                };
                var viewController = page.CreateViewController();
                MasterNavigationController.PushViewController(viewController, true);
                return;
            }

            if (request.ViewModelType == typeof(FormsTabViewModel))
            {
                var page = new TabPage()
                {
                    BindingContext = viewModel
                };
                var viewController = page.CreateViewController();
                var attribute      = new MvxTabPresentationAttribute()
                {
                    TabName = page.Title
                };
                TabBarViewController.ShowTabView(viewController, attribute);
                return;
            }
            base.Show(request);
        }
        public override void ViewDidLoad()
        {
            base.ViewDidLoad();

            // Do any additional setup after loading the view.
            // Initialize Xamarin.Forms framework
            global::Xamarin.Forms.Forms.Init();
            // Create an instance of XF page with associated View Model
            var xfPage = new TestPage();
            //var viewModel = (MainPageViewModel)xfPage.BindingContext;
            //viewModel.Message = "Welcome to XF Page created from an iOS Extension";
            // Override the behavior to complete the execution of the Extension when a user press the button
            //viewModel.DoCommand = new Command(() => DoneClicked(this));
            // Convert XF page to a native UIViewController which can be consumed by the iOS Extension
            var newController = xfPage.CreateViewController();

            // Present new view controller as a regular view controller
            this.PresentModalViewController(newController, false);
        }