function single_row( $item ) {
		static $even = false;

		if ( $even ) {
			$row_class = ' class="even"';
		} else {
			$row_class = ' class="alternate odd"';
		}

		if ( 'activity_comment' === $item['type'] ) {
			$root_id = $item['item_id'];
		} else {
			$root_id = $item['id'];
		}

		echo '<tr' . $row_class . ' id="activity-' . esc_attr( $item['id'] ) . '" data-parent_id="' . esc_attr( $item['id'] ) . '" data-root_id="' . esc_attr( $root_id ) . '">';
		echo $this->single_row_columns( $item );
		echo '</tr>';

		$even = ! $even;
	}