public function getColumnWidthBetween($columnA, $columnB) {
        $width = 0;
        $check = false;
        foreach ($this->columnDefinition as $key => $def) {
            // begin sum either from start, or from column A
            if ($key == $columnA || !$columnA) {
                $check = true;
            }
            // stop sum if we want width from start to column B
            if (!$columnA && $key == $columnB) {
                break;
            }
            if ($check) {
                $width += $def['width'];
            }
            if ($key == $columnB) {
                break;
            }
        }
        return $width;
    }