app/code/core/Mage/Adminhtml/Block/Report/Product/Lowstock/Grid.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Adminhtml low stock products report grid block
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Report_Product_Lowstock_Grid extends Mage_Adminhtml_Block_Widget_Grid
{
//    protected $_saveParametersInSession = true;

    public function __construct()
    {
        parent::__construct();
        $this->setId('gridLowstock');
        $this->setUseAjax(false);
    }

    protected function _prepareCollection()
    {
        if ($this->getRequest()->getParam('website')) {
            $storeIds = Mage::app()->getWebsite($this->getRequest()->getParam('website'))->getStoreIds();
            $storeId = array_pop($storeIds);
        } else if ($this->getRequest()->getParam('group')) {
            $storeIds = Mage::app()->getGroup($this->getRequest()->getParam('group'))->getStoreIds();
            $storeId = array_pop($storeIds);
        } else if ($this->getRequest()->getParam('store')) {
            $storeId = (int)$this->getRequest()->getParam('store');
        } else {
            $storeId = '';
        }

        $collection = Mage::getModel('catalog/product')->getCollection()
            ->addAttributeToSelect('*')
            ->setStoreId($storeId)
            ->addAttributeToFilter('type_id', array(
                Mage_Catalog_Model_Product_Type::TYPE_SIMPLE,
                Mage_Catalog_Model_Product_Type::TYPE_VIRTUAL
            ))
            ->joinField('qty',
                'cataloginventory/stock_item',
                'qty',
                'product_id=entity_id',
                '{{table}}.stock_id=1',
                'left')
            ->setOrder('qty', 'asc');

        if( $storeId ) {
            $collection->addStoreFilter($storeId);
        }

        $this->setCollection($collection);
        return parent::_prepareCollection();
    }

    protected function _prepareColumns()
    {
        $this->addColumn('name', array(
            'header'    =>Mage::helper('reports')->__('Product Name'),
            'sortable'  =>false,
            'index'     =>'name'
        ));

        $this->addColumn('sku', array(
            'header'    =>Mage::helper('reports')->__('Product Sku'),
            'sortable'  =>false,
            'index'     =>'sku'
        ));

        $this->addColumn('qty', array(
            'header'    =>Mage::helper('reports')->__('Stock Qty'),
            'width'     =>'215px',
            'align'     =>'right',
            'sortable'  =>false,
            'filter'    =>'adminhtml/widget_grid_column_filter_range',
            'index'     =>'qty',
            'type'      =>'number'
        ));

        $this->addExportType('*/*/exportLowstockCsv', Mage::helper('reports')->__('CSV'));
        $this->addExportType('*/*/exportLowstockExcel', Mage::helper('reports')->__('Excel'));

        return parent::_prepareColumns();
    }
}

---