display control doesn't have checkbox

I have a lot of checkboxes (with yes/no fields in the underlying tables) and lately Access has been crashing a lot. After some research it seems null values in the checkboxes could be to blame, so I set out to follow Allen Browne's instructions (http://allenbrowne.com/NoYesNo.html) for replacing them with number fields. Everything was going great until I got to the step where I set the display control to 106 (checkbox). This is not an option in the table and I don't understand why. I set my table up like he stated but I only have the option for a textbox, listbox, or combobox.

I also tried just typing 106 into the Display Control field, but it gives me an error that it isn't an item on the list. In his article, he mentions to fix the error above to use SetPropertyDAO(), but I have no idea what that means, how to do it, or where to do it. Do I built it in code somewhere? The link he has brings you to a script where he uses that to fix his printers or something.