private void OnDialogResult(NotificationMessage <MessageDialogResult> result)
        {
            switch (result.Notification)
            {
            case "ConfirmDeleteServerDialogResult":
                if (SelectedServer == null)
                {
                    return;
                }
                if (result.Content == MessageDialogResult.Negative)
                {
                    return;
                }
                var server = SelectedServer;
                SelectedServer = null;
                ServerModelSet.DeleteServer(server);
                break;

            default:
                return;
            }
        }
 private void NewServer()
 {
     ServerModelSet.NewServer();
     SelectedServer = ServerModelSet.Servers.Last();
 }