4 Replies
Walt Hamilton

Just for what it is worth, every since the first graphic interface, computer users have been accustomed to the convention that radio buttons are designed to allow one and only one of them to be selected at a time. If there are two groups of them, each group is enclosed in some sort of visual fence to indicate which ones are part of which group. If the user can select more than one option at the same time, custom calls for check boxes to be used.

Mind you, the programming police are not going to come and torture you if you depart from convention, but your users most likely will be confused.