thanks, @nicrivard for providing this workaround. it creates checkboxes in tabs, exactly what i was looking for. but one problem appears:
expected: i click on a box, a hook appears. i close the pane and when i open it next time the hook is in the box I clicked on.
what happens: after i click on a box, the hook appears. but when i close the pane and open it again, the hook has disappeared.
any ideas?