public function refreshRowDimensions()
    {
        $currentRowDimensions = $this->getRowDimensions();
        $newRowDimensions = array();

        foreach ($currentRowDimensions as $objRowDimension) {
            $newRowDimensions[$objRowDimension->getRowIndex()] = $objRowDimension;
        }

        $this->_rowDimensions = $newRowDimensions;

        return $this;
    }