I have an application, a datagrid, with a login form and 70 users that can login into application. The users are in 5 different groups. All of them can have access to the datagrid. All of them can modify and see all information. All of them can edit and delete rows from the report. I want to make a restriction for group called "Group_Planned", to not be able to modify anything and to not see all information. For eg column "Time" from that grid to cannot see it. How can I do this in Apex? Thank you!