/// <summary>
 /// helper to fire the InPreview event
 /// </summary>
 private void ImageIsInPreview()
 {
     if (this.InvokeRequired)
     {
         SetInPreviewCallback d = new SetInPreviewCallback(ImageIsInPreview);
         this.Invoke(d, null);
     }
     else
     {
         addLog("ImageIsInPreview");
         CameraPreview.Update();
         OnInPreview(new EventArgs());
     }
 }
 private void ImageIsInPreview()
 {
     if (this.InvokeRequired)
     {
         SetInPreviewCallback d = new SetInPreviewCallback(ImageIsInPreview);
         this.Invoke(d, null);
     }
     else
     {
         addLog("ImageIsInPreview");
         ImagerPreview.Update();
         OnInPreview(new EventArgs());
     }
 }