private void buttonCalibrate_Click(object sender, EventArgs e) { if (Program.eyeTrackingEngine.State == EyeTrackingState.Tracking) { CalibrationWinForm calibrationForm = new CalibrationWinForm(eyeTrackingEngine); calibrationForm.ShowDialog(); calibrationForm.Dispose(); calibrationForm = null; } else { messageEyetrackerNotConnected(); } }