private void PaymentViewModelList_RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            var senderElement = sender as FrameworkElement;
            var flyoutBase = FlyoutBase.GetAttachedFlyout(senderElement);

            flyoutBase.ShowAt(senderElement);
        }

 private void ImageToAdd_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     if (sender.GetType() == typeof(Image))
         ImageToAdd_CreateDropDownMenu(sender as Image, e.GetPosition(sender as Image));
     else
         throw new Exception("Error: Expected sender to be Image but was: " + sender.GetType().ToString());
 }

        private new async void RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            Tweet tweet = null;
            var clickBorder = e.OriginalSource as TextBlock;
            if (clickBorder != null)
            {
                tweet = (Tweet)clickBorder.DataContext;
            }
            // Create a menu and add commands specifying a callback delegate for each.
            // Since command delegates are unique, no need to specify command Ids.
            var menu = new PopupMenu();
            menu.Commands.Add(new UICommand("open tweet", (command) =>
            {
                OpenPage(tweet);
            }));
            menu.Commands.Add(new UICommand("copy to clipboard", (command) =>
            {
                CopyText();
            }));


            var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
            if (chosenCommand == null) // The command is null if no command was invoked.
            {

            }
        }

 private void StackPanel_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     var uiSender = sender as UIElement;
     var flyout = (FlyoutBase)uiSender.GetValue(FlyoutBase.AttachedFlyoutProperty);
     flyout.Placement = FlyoutPlacementMode.Bottom;
     flyout.ShowAt(uiSender as FrameworkElement);
 }

 async  private void ShowImagePopupMenu(object sender, RightTappedRoutedEventArgs e)
  {
      PopupMenu menu = new PopupMenu();
      menu.Commands.Add(new UICommand("分享到", async (command) =>
      {
          MessageDialog md = new MessageDialog(command.Label);
          await md.ShowAsync();
      }));
      menu.Commands.Add(new UICommand("另存为", async (command) =>
      {
          MessageDialog md = new MessageDialog(command.Label);
          await md.ShowAsync();
      }));
      menu.Commands.Add(new UICommand("编辑", async (command) =>
      {
          MessageDialog md = new MessageDialog(command.Label);
          await md.ShowAsync();
      }));
      menu.Commands.Add(new UICommandSeparator());
      menu.Commands.Add(new UICommand("打印", async (command) =>
      {
          MessageDialog md = new MessageDialog(command.Label);
          await md.ShowAsync();
      }));
      menu.Commands.Add(new UICommand("全屏", async (command) =>
      {
          MessageDialog md = new MessageDialog(command.Label);
          await md.ShowAsync();
      }));
      var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
  }

 protected override void OnRightTapped(RightTappedRoutedEventArgs e) {
     if (_IsPointerPressed) {
         ShowContextMenu(null, e.GetPosition(null));
         e.Handled = true;
     }
     base.OnRightTapped(e);
 }

        private void AccountList_RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            var senderElement = sender as FrameworkElement;
            var flyoutBase = FlyoutBase.GetAttachedFlyout(senderElement) as MenuFlyout;

            flyoutBase?.ShowAt(senderElement, e.GetPosition(senderElement));
        }

 private void WallpaperOnRightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     if(ViewModelLocator.Mobile)
         return;
     var grid = sender as FrameworkElement;
     FlyoutBase.GetAttachedFlyout(grid).ShowAt(grid);
 }

 private void SavedFile_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     var item = sender as FrameworkElement;
     if(item != null)
     {
         FlyoutBase.ShowAttachedFlyout(item);
     }
 }

 private void LayoutRoot_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     if (IsHolding)
         return;
     var targetElement = sender as FrameworkElement;
     MenuFlyout flyout = (MenuFlyout)FlyoutBase.GetAttachedFlyout(targetElement);
     flyout.ShowAt(targetElement, e.GetPosition(targetElement));
 }

 private void UiElementOnRightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     if (isPointerPressed)
     {
         ShowMenu(e.GetPosition(uiElement));
         e.Handled = true;
     }
 }

        private void TopicOnRightClick(object sender, RightTappedRoutedEventArgs e)
        {
            if (ViewModel.PrevArgs.WorkMode == ForumBoardPageWorkModes.WatchedTopics || ViewModel.PrevArgs.WorkMode == ForumBoardPageWorkModes.UserSearch)
                return;

            if ((e.OriginalSource as FrameworkElement).DataContext is ForumTopicEntryViewModel)
                ItemFlyoutService.ShowForumTopicFlyout(e.OriginalSource as FrameworkElement);
            e.Handled = true;
        }

 private void OcrListItem_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     FrameworkElement element = sender as FrameworkElement;
     if (element == null)
     {
         return;
     }
     var flyout = FlyoutBase.GetAttachedFlyout(element) as MenuFlyout;
     flyout?.ShowAt(this, e.GetPosition(null));
 }

 private void TrackStackPanel_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     FrameworkElement senderElement = sender as FrameworkElement;
     FlyoutBase flyoutBase = FlyoutBase.GetAttachedFlyout(senderElement);
     flyoutBase.ShowAt(senderElement);
     //var flyout = this.Resources["TrackContextMenu"] as MenuFlyout;
     //flyout.ShowAt((UIElement)AlbumPage, new Windows.Foundation.Point(0, 0));
     //flyout.ShowAt((UIElement)sender, new Windows.Foundation.Point(0, 0));
     //flyout.ShowAt((FrameworkElement)sender);
 }

        private void Grid_RightTapped( object sender, RightTappedRoutedEventArgs e )
        {
            Grid ItemGrid = ( Grid ) sender;
            FlyoutTargetItem = ItemGrid.DataContext as BookmarkListItem;

            if ( FlyoutTargetItem.AnchorIndex != -1 )
            {
                FlyoutBase.ShowAttachedFlyout( ItemGrid );
            }
        }

        async void OnTextBlockRightTapped(object sender, RightTappedRoutedEventArgs e) {
            PopupMenu popupMenu = new PopupMenu();
            popupMenu.Commands.Add(new UICommand("Larger Font", OnFontSizeChanged, 1.2));
            popupMenu.Commands.Add(new UICommand("Smaller Font", OnFontSizeChanged, 1 / 1.2));
            popupMenu.Commands.Add(new UICommandSeparator());
            popupMenu.Commands.Add(new UICommand("Red", OnColorChanged, Colors.Red));
            popupMenu.Commands.Add(new UICommand("Green", OnColorChanged, Colors.Green));
            popupMenu.Commands.Add(new UICommand("Blue", OnColorChanged, Colors.Blue));

            await popupMenu.ShowAsync(e.GetPosition(this));
        }

        private async void ListViewNotes_RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            var menu = new PopupMenu();
            menu.Commands.Add(new UICommand("Edit"));

            var chosenCommand = await menu.ShowForSelectionAsync(GetElementRect((FrameworkElement)sender));
            if (chosenCommand.Label == "Edit")
            {
                this.Frame.Navigate(
                typeof(NoteDetailPage),
                sender,
                new Windows.UI.Xaml.Media.Animation.DrillInNavigationTransitionInfo());
            }
        }

        private void ePubItemRightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            FrameworkElement ancestor = sender as FrameworkElement;

            while (ancestor != null)
            {
                if (ancestor is MainPage)
                {
                    (ancestor as MainPage).ePubItemRightTapped(sender, e);
                    break;
                }

                ancestor = VisualTreeHelper.GetParent(ancestor) as FrameworkElement;
            }
        }

        private void listView_RightTapped(object sender, RightTappedRoutedEventArgs e)
        {
            FrameworkElement element = (FrameworkElement)sender;

            if (e.OriginalSource.GetType() == typeof(ListViewItemPresenter))
                device = (Device)((ContentPresenter)e.OriginalSource).Content;
            else if (e.OriginalSource.GetType() == typeof(StackPanel))
                device = (Device)((FrameworkElement)e.OriginalSource).DataContext;
            else
                device = (Device)((FrameworkElement)((FrameworkElement)e.OriginalSource).Parent).DataContext;

            if (device.MacAddress.StartsWith("b8:27:eb"))
                mf_pi.ShowAt(element, point);
            else
                mf_netmf.ShowAt(element, point);
        }

 private void Grid_RightTapped(object sender, RightTappedRoutedEventArgs e)
 {
     var grid = sender as Grid;
     var childCount = VisualTreeHelper.GetChildrenCount(grid);
     for (int i = 0; i < childCount; i++)
     {
         var child = VisualTreeHelper.GetChild(grid, i);
         if (child is TextBlock)
         {
             if (child.GetValue(TextBlock.NameProperty).ToString() == "text_uniqueId")
             {
                 _rightTappedGuid = child.GetValue(TextBlock.TextProperty).ToString();
             }
         }
     }
     FlyoutBase.ShowAttachedFlyout(sender as Grid);
 }