private void listBox_OnSelectionChangedListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
 {
     if (!_isLoading)
     {
         _isListChanging = true;
         _currentClient  = _repo.LoadClientGraph((int)clientListBox.SelectedValue);
         _clientViewSource.ObjectInstance = _currentClient;
         _isListChanging = false;
     }
 }