public App() { InitializeComponent(); //var MainPage = new MainPage(); // MainPage = new NavigationPage(new MainPage()); var menuPage = new MenuPage(); NavigationPage = new NavigationPage(new MainPage()); var rootPage = new RootPage(); rootPage.Master = menuPage; rootPage.Detail = NavigationPage; MainPage = rootPage; //for (int i = 0; i < 10; i++) //{ // ToolbarItem tb = new ToolbarItem(); // tb.Text = "123"; // tb.Icon = "aa"; // NavigationPage.ToolbarItems.Add(tb); //} }