calendar participants list shows all active users and groups

Why does the calendar participants list show all users and all groups when the user is only assigned to one group?

When adding or editing a calendar item, the participants list shows all active users and groups in phpgroupware.  How can we filter the list so that only the users that belong to the group(s) of the current user are populated in the list?Sent from the phpGroupWare forums @ http://forums.phpGroupWare.org