Thank you for the reply, George. Yes, I would want to change the border color when an image is selected. Ideally, a deselected image would have no border at all (white?) and the selected image would have a black border.
Additionally, I'd want the ability to have none of a group selected when the file is opened, or when a 'Reset' button is clicked. I already have the Reset button configured and working well in the current iteration of the form.
Thanks again for your input.
I'll try to put together and post a sample some time this weekend that you can use as a guide.