Checkboxes in Shared Workbook
 

I created a shared Excel sheet with tons of checkboxes. These checkboxes
were created before I shared it of course. The problem is, the checkboxes
doesn't get updated on other user's open shared file. This is set for
"Update when Saving". So I made sure that each computer is saving the Excel
file to see the other user's checkbox change, but no updating occurs. It
will, if numbers are changed. I've looked and didn't come across a rule that
checkboxes weren't possible through shared workbook feature. Does a code
need to be put in to make them active??
I'm using Excel 2002 on 2000 Prof machine.
Please advise.

Thank you!