Access wasn't originally design for developers. It was designed for that clerk to create a small office database. I believe you can get around this buy creating the button, making it invisible but active, and then creating an image and laying it on top of the invisible button. Play with it and see what you can do.
Oh, and there is software out there where you can make custom buttons. Do a search in the Access forums and you should find threads with links to several companies... Terry
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