I have never tried it so I do not know if it is possible. I would not do it if you have Store Type set to ietThumb or ietFastThumb because then you would be painting the thumbnail and not the image.
I paint with the ImageEnView and update the ImageEnMView to show the changes by setting the assigned image to index:
ImageEnMView1.SetIEBitmap(ImageEnMView1.SelectedImage, ImageEnView1.IEBitmap);
William Miller
Adirondack Software & Graphics
Email: w2m@frontiernet.net
EBook: http://www.imageen.com/ebook/
Apprehend: http://www.frontiernet.net/~w2m/index.html