app/code/core/Mage/Adminhtml/Block/Customer/Edit/Tab/View/Sales.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 customer view wishlist block
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Customer_Edit_Tab_View_Sales extends Mage_Adminhtml_Block_Template
{

    /**
     * Enter description here...
     *
     * @var Mage_Sales_Model_Entity_Sale_Collection
     */
    protected $_collection;

    protected $_groupedCollection;
    protected $_websiteCounts;

    /**
     * Enter description here...
     *
     * @var Mage_Directory_Model_Currency
     */
    protected $_currency;

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

    public function _beforeToHtml()
    {
        $this->_currency = Mage::getModel('directory/currency')
            ->load(Mage::getStoreConfig(Mage_Directory_Model_Currency::XML_PATH_CURRENCY_BASE))
        ;

        $this->_collection = Mage::getResourceModel('sales/sale_collection')
            ->setCustomerFilter(Mage::registry('current_customer'))
            ->load()
        ;

        $this->_groupedCollection = array();

        foreach ($this->_collection as $sale) {
            if (!is_null($sale->getStoreId())) {
                $store      = Mage::app()->getStore($sale->getStoreId());
                $websiteId  = $store->getWebsiteId();
                $groupId    = $store->getGroupId();
                $storeId    = $store->getId();

                $sale->setWebsiteId($store->getWebsiteId());
                $sale->setWebsiteName($store->getWebsite()->getName());
                $sale->setGroupId($store->getGroupId());
                $sale->setGroupName($store->getGroup()->getName());
            }
            else {
                $websiteId  = 0;
                $groupId    = 0;
                $storeId    = 0;

                $sale->setStoreName(Mage::helper('customer')->__('Deleted Stores'));
            }

            $this->_groupedCollection[$websiteId][$groupId][$storeId] = $sale;
            $this->_websiteCounts[$websiteId] = isset($this->_websiteCounts[$websiteId]) ? $this->_websiteCounts[$websiteId] + 1 : 1;
        }

        return parent::_beforeToHtml();
    }

    public function getWebsiteCount($websiteId)
    {
        return isset($this->_websiteCounts[$websiteId]) ? $this->_websiteCounts[$websiteId] : 0;
    }

    public function getRows()
    {
        return $this->_groupedCollection;
    }

    public function getTotals()
    {
        return $this->_collection->getTotals();
    }

    public function getPriceFormatted($price)
    {
        return $this->_currency->format($price);
    }

}

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