*snip*
>Would your suggestion for combo's be true for checkboxes also?

Checkboxes shouldn't need any special treatment. At least with the stuff I tested with. Is it displaying a problem?

Comboboxes in grids have always been problematic for me. It wasn't until I started reading some of Marcia Akins's posts on the subject that I finally got them to work like I wanted. All the other controls seem to work okay (even grids within grids - just for fun).