private void flipView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            FlipView fv = sender as FlipView;
            if (fv.SelectedItem == null) return;
            if (e.AddedItems.Count > 0)
            {
                FlipViewItem initem = fv.ItemContainerGenerator.ContainerFromItem(e.AddedItems[0]) as FlipViewItem;
                if (initem != null)
                {
                    MediaPlayer mp1 = FindFirstElementInVisualTree<MediaPlayer>(initem);
                    mp1.Play();
                }
            }

        }


        private T FindFirstElementInVisualTree<T>(DependencyObject parentElement) where T : DependencyObject
        {
            var count = VisualTreeHelper.GetChildrenCount(parentElement);
            if (count == 0)
                return null;

            for (int i = 0; i < count; i++)
            {
                var child = VisualTreeHelper.GetChild(parentElement, i);

                if (child != null && child is T)
                {
                    return (T)child;
                }
                else
                {
                    var result = FindFirstElementInVisualTree<T>(child);
                    if (result != null)
                        return result;

                }
            }
            return null;
        }