private void InitializeEyeTracker(Uri url)
        {
            Trace.WriteLine("Initializing eye tracker " + url.ToString());

            try
            {
                _tracker = new EyeTracker(url);
            }
            catch (EyeTrackerException ex)
            {
                HandleError(ex.Message);
                return;
            }

            _tracker.EyeTrackerError += OnEyeTrackerError;
            _tracker.GazeData        += OnGazeData;
            _tracker.RunEventLoopOnInternalThread(OnGenericOperationCompleted);
            _tracker.ConnectAsync(OnConnectCompleted);
        }