function display(
        VF_Search_Form $searchForm,
        $level,
        $prevLevel = false,
        $displayBrTag = null,
        $yearRangeAlias = null
    ) {
        $this->displayBrTag = $displayBrTag;
        $this->searchForm = $searchForm;
        $this->level = $level;
        $this->prevLevel = $prevLevel;
        $this->yearRangeAlias = $yearRangeAlias;
        return $this->_display();
    }