public MainScreen() { InitiateApplication(); var tab1 = new UIViewController(); tab1.Title = "one"; tab1.TabBarItem = new UITabBarItem(UITabBarSystemItem.Favorites, 0); var allContactsScreen = new AllContactsScreen(); var tab2 = new UINavigationController(allContactsScreen); tab2.Title = "Contacts"; tab2.TabBarItem = new UITabBarItem(UITabBarSystemItem.Contacts, 0); // var tab2 = new UIViewController(); // tab2.Title = "Two"; var tab3 = new UIViewController(); tab3.Title = "three"; tab3.TabBarItem = new UITabBarItem(UITabBarSystemItem.History, 0); var tab4 = new UIViewController(); tab4.Title = "four"; tab4.TabBarItem = new UITabBarItem(UITabBarSystemItem.More, 0); _tabs = new UIViewController[] { tab1, tab2, tab3, tab4 }; this.ViewControllers = _tabs; this.SelectedViewController = tab2; }