private void Viewer_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
var grid = (Grid)sender;
FlyoutEx.ShowAttachedFlyoutAtPointer(grid);
}
private void Panel_RightTapped(object sender, RightTappedRoutedEventArgs e)
{
var panel = (Grid)sender;
FlyoutEx.ShowAttachedFlyoutAtPointer(panel);
}