Context Menus and Popup Menu บน Windows Store Apps (C#)

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using Windows.Foundation;
using Windows.Foundation.Collections;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls;
using Windows.UI.Xaml.Controls.Primitives;

using Windows.UI.Popups;

// The Blank Page item template is documented at http://go.microsoft.com/fwlink/?LinkId=234238

namespace WindowsStoreApps
{
    /// <summary>
    /// An empty page that can be used on its own or navigated to within a Frame.
    /// </summary>
    /// 


    public sealed partial class MainPage : Page
    {
        public MainPage()
        {
            this.InitializeComponent();
        }

        private async void OpenPopupMenu_Click(object sender, RoutedEventArgs e)
        {
            PopupMenu menu = new PopupMenu();

            menu.Commands.Add(new UICommand
            {
                Id = 1,
                Label = "Menu 1",
                Invoked = DoTasks
            });
            menu.Commands.Add(new UICommand
            {
                Id = 2,
                Label = "Menu 2",
                Invoked = DoTasks
            });
            menu.Commands.Add(new UICommand
            {
                Id = 3,
                Label = "Menu 3",
                Invoked = DoTasks
            });

            menu.Commands.Add(new UICommand
            {
                Id = 4,
                Label = "Menu 4",
                Invoked = DoTasks
            });
            menu.Commands.Add(new UICommand
            {
                Id = 5,
                Label = "Menu 5",
                Invoked = DoTasks
            });

            var pointTransform = ((Button)sender).TransformToVisual(Window.Current.Content);
            var screenCoords = pointTransform.TransformPoint(new Point(210, 100));
            

            await menu.ShowAsync(screenCoords);
        }

        private void DoTasks(IUICommand command)
        {
            var currentId = (int)command.Id;
            MessageDialog msgDialog;
            switch (currentId)
            {
                case 1:
                    msgDialog = new MessageDialog( "Menu 1","Your selected");
                    msgDialog.ShowAsync();
                    break;
                case 2:
                    msgDialog = new MessageDialog("Menu 2", "Your selected");
                    msgDialog.ShowAsync();
                    break;
                case 3:
                    msgDialog = new MessageDialog("Menu 3", "Your selected");
                    msgDialog.ShowAsync();
                    break;
                case 4:
                    msgDialog = new MessageDialog("Menu 4", "Your selected");
                    msgDialog.ShowAsync();
                    break;
                case 5:
                    msgDialog = new MessageDialog("Menu 5","Your selected");
                    msgDialog.ShowAsync();
                    break;
                default :
                    break;

            }
        }

    }
}