private void ServerBrowserOnSelectionChanged(Object sender, SelectionChangedEventArgs e)
        {
            if (e.AddedItems.Count == 0)
            {
                _viewModel.SelectedServer = null;
                return;
            }

            ServerObservable server = e.AddedItems[0] as ServerObservable;

            _viewModel.SelectedServer = server;
            _viewModel.DoPingOne(server);
        }