Bryan,
In VFP5 or 6 you can use a TopLevel form where you have access to the Resize(). In VFP3 you have to resort to a timer object that periodically checks for a change in the screen size.
>How do I reposition (center) the image object when the user changes the _screen size (resize or maximize/restore)? I didn't see a Resize method for the _screen object.