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MediaElement player = new MediaElement();
player.Stretch = Stretch.Fill;
player.Source = new Uri(dlg.FileName);
player.LoadedBehavior = MediaState.Manual;
player.MediaEnded += new RoutedEventHandler(player_MediaEnded);
contentControl.Width = 400;
contentControl.Height = 300;
contentControl.Content = player;
player.Play();