protected function _renderRangeLabel($fromPrice, $toPrice) { //if (method_exists(get_parent_class($this), "_renderRangeLabel")) { // return parent::_renderRangeLabel($fromPrice, $toPrice); // } else { $range = $toPrice - $fromPrice; $value = $toPrice / $range; return parent::_renderItemLabel($range, $value); //} }