void OnItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var todoPage = new TodoItemPage();

            todoPage.BindingContext = e.SelectedItem as TodoItem;
            Navigation.PushAsync(todoPage);
        }
		void OnItemSelected (object sender, SelectedItemChangedEventArgs e)
		{
			var todoItem = e.SelectedItem as TodoItem;
			var todoPage = new TodoItemPage ();
			todoPage.BindingContext = todoItem;
			Navigation.PushAsync (todoPage);
		}
        void OnAddItemActivated(object sender, EventArgs e)
        {
            var todoPage = new TodoItemPage();

            todoPage.BindingContext = new TodoItem();
            Navigation.PushAsync(todoPage);
        }
		void OnAddItemClicked (object sender, EventArgs e)
		{
			var todoItem = new TodoItem ();
			var todoPage = new TodoItemPage ();
			todoPage.BindingContext = todoItem;
			Navigation.PushAsync (todoPage);
		}