private function SaveGroups()
    {
        $assignedIDs = $this->AssignedGroupIDs();
        $selectedIDs = Request::PostArray('Group');
        $this->ClearMembergroups($selectedIDs);
        foreach ($selectedIDs as $selectedID)
        {
            if (!in_array($selectedID, $assignedIDs))
            {
                $confirmGroup = new RegisterConfirmMembergroup();
                $confirmGroup->SetConfirm($this->confirm);
                $confirmGroup->SetMemberGroup(Membergroup::Schema()->ByID($selectedID));
                $confirmGroup->Save();
            }
        }
    }