public function _display_render( $field, $val ) {
		$return = '';
		$posts = array();

		if ( ! empty( $val ) ) {
			foreach ( (array) $val as $id ) {
				$title = get_the_title( $id );
				if ( $title ) {
					$edit_link = get_edit_post_link( $id );
					$posts[ $id ] = compact( 'title', 'edit_link' );
				}
			}
		}

		if ( ! empty( $posts ) ) {

			$return .= '<ol>';
			foreach ( (array) $posts as $id => $post ) {
				$return .= sprintf(
					'<li id="attached-%d"><a href="%s">%s</a></li>',
					$id,
					$post['edit_link'],
					$post['title']
				);
			}
			$return .= '</ol>';

		} else {
			$return .= '&mdash;';
		}

		return $return;
	}