public function delete()
 {
     if (!$this->securitypolicy->validateAccessRight(3, 'delete')) {
         $this->load->view('access_denied');
     }
     $usergroup = new Usergroup($this->input->post('usergroup-id'));
     $usergroup->remove();
     $response = empty($usergroup->errors) ? 'success' : 'error';
     $this->session->set_userdata(array('status' => $response));
     redirect('Admin/usergroup_manager', 'refresh');
 }