>In addition to what Bruce said, since it's a CheckBox you will want to ensure that the columns CurrentControl is set to the Checkbox and ther column's Sparse setting is .F. so that the box appears in all grid cells not just the highlighted one.
Quite so...and you may want to just delete the default textbox from the column if it's still there, to clean things up...
The Anonymous Bureaucrat,
and frankly, quite content not to be
a member of either major US political party.