public void startCourse()
        {
            if (course == null)
            {
                buildCourse();
            }
            if (queue1.NotEmpty)
            {
                queue1.start();
            }
            else
            {
                StimulyEllipse1.Visibility = System.Windows.Visibility.Hidden;
            }

            if (checkPointTimer != null && built)
            {
                checkPointTimer.Start();
                ShowNextCheckPoint(null, null);
            }
        }