>I just upgraded from VFP 8 to VFP 9, and have found a problem with my Graphical Checkboxes (and Graphical Radio Buttons). In VFP 8, the checked (on) graphical checkboxes remined sunken so the user could notice that the button was checked.
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>Now in VFP 9, the button does not reflect a sunken view.
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>Is this a bug, a behavioral change or I am missing a new property in order to have the sunken effect when the object is 'checked'?

VFP9 respects the BackColor property of the checkbox. The default BackColor for checkbox dropped into a column of the grid is RGB(255,255,255) (white). Change it to RGB(212,208,200) or whatever color you want grahical checkbox to be.
VFP8 ignores BackColor property of the checkbox which I think is a bug.