/********************************************************************
* Camera
* _camera_form
********************************************************************/
        private void cameraToolStripMenuItem_Click(object sender, EventArgs e)
        {
            if (_camera_form == null)
            {
                _camera_form               = new ControlCameraForm();
                _camera_form.FormClosed   += formClosed_CameraForm;
                _camera_form.RaiseXYEvent += OnRaiseCameraClickEvent;
                //               _camera_form.setPosMarker(grbl.posMarker);// visuGCode.GetPosMarker());
            }
            else
            {
                _camera_form.Visible = false;
            }
            _camera_form.Show(this);
            _camera_form.WindowState = FormWindowState.Normal;
        }
 private void formClosed_CameraForm(object sender, FormClosedEventArgs e)
 {
     _camera_form = null;
 }