public function formatValues($value)
    {
        $options = $this->getOptions();
        if (is_array($value)) {
            if ($options) {
                foreach ($value as &$val) {
                    if (isset($options[$val])) {
                        $val = $options[$val];
                    }
                 }
            }
            return implode($this->_('; '), $value);
        }
        if (isset($options[$value])) {
            return $options[$value];
        }
        return $value;
    }