Gary,

>with a data-replace to its Control source, "Update" the cursor (if you want), and then refresh the grid<

Ok, I think I see what you are saying. I did the following instead:

IF m.nKeyCode = 13
	IF MyGrdTable.wk01 = 0
            * New line added.
	    REPLACE MyGrdTable.wk01 WITH 1
	ELSE
            * New line added.
	    REPLACE MyGrdTable.wk01 WITH 0
	ENDIF
        * New line added.
        THISFORM.cmDataManager.Update('MyGrdTable')
	THIS.PARENT.PARENT.Column4.chkCheckboxCustom1.REFRESH()
	NODEFAULT
ELSE
	DODEFAULT(nKeyCode, nShiftAltCtrl)
ENDIF

This does the trick, even with the refresh just on the chkBox.

Are you saying this takes less overhead, than the Form.Save()? If so, is it because the cmDataManager.Update() just updates the cursor passed to it?

You have been a big help on this one... and I am greateful.

Mel Cummings