public function getRowDimension($pRow, $create = true)
    {
        // Found
        $found = null;

        // Get row dimension
        if (!isset($this->rowDimensions[$pRow])) {
            if (!$create) {
                return null;
            }
            $this->rowDimensions[$pRow] = new RowDimension($pRow);

            $this->cachedHighestRow = max($this->cachedHighestRow, $pRow);
        }

        return $this->rowDimensions[$pRow];
    }