private void UpdateAnalytic(object sender, SelectionChangedEventArgs e)
 {
     //Debug.WriteLine(selectedPlayer.NickName);
     if (courseViewModel == null)
     {
         Debug.WriteLine("course view model is null");
         return;
     }
     if (PlayerSelection.SelectedItem != null)
     {
         courseViewModel.update_analytic(PlayerSelection.SelectedItem as PlayerViewModel);
     }
     courseViewModel.NotifyProperties();
 }