private function findOrMakeUserOptionFor(AttendeeExtraFieldOption $attendeeOption)
    {
        if (!$option = $this->getUserFieldOption()->byID($attendeeOption->ID)) {
            $option = UserFieldOption::create();
        }

        $option->ID = $attendeeOption->ID;
        $option->Title = $attendeeOption->Title;
        $option->Default = $attendeeOption->Default;
        $option->Sort = $attendeeOption->Sort;
        return $option;
    }