I need a Authentication / Group Membership system set-up within my VB Silverlight 4 application. This system should allow for multiple businesses to set-up a Company Group that holds company members with different Administrative privileges. Also, all data entered can only be viewed by the company that entered the data. All tables must be viewable by the creating company. Admin page needs to be contructed with a datagrid that shows logged on Company users. The company admin can also add and edit users from this area. This is a private project.