public function resolveId($id = null)
    {
        if ($id === null) {
            $id = $this->owner->getId();
        }
        if (isset($this->owner->htmlOptions['id'])) {
            $id = $this->owner->htmlOptions['id'];
        } else {
            $this->owner->htmlOptions['id'] = $id;
        }
        return $id;
    }