app/code/core/Mage/Adminhtml/Block/Customer/Edit/Tabs.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)
 */

/**
 * admin customer left menu
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Customer_Edit_Tabs extends Mage_Adminhtml_Block_Widget_Tabs
{

    public function __construct()
    {
        parent::__construct();
        $this->setId('customer_info_tabs');
        $this->setDestElementId('edit_form');
        $this->setTitle(Mage::helper('customer')->__('Customer Information'));
    }

    protected function _beforeToHtml()
    {
/*
        if (Mage::registry('current_customer')->getId()) {
            $this->addTab('view', array(
                'label'     => Mage::helper('customer')->__('Customer View'),
                'content'   => $this->getLayout()->createBlock('adminhtml/customer_edit_tab_view')->toHtml(),
                'active'    => true
            ));
        }
*/
        $this->addTab('account', array(
            'label'     => Mage::helper('customer')->__('Account Information'),
            'content'   => $this->getLayout()->createBlock('adminhtml/customer_edit_tab_account')->initForm()->toHtml(),
            'active'    => Mage::registry('current_customer')->getId() ? false : true
        ));

        $this->addTab('addresses', array(
            'label'     => Mage::helper('customer')->__('Addresses'),
            'content'   => $this->getLayout()->createBlock('adminhtml/customer_edit_tab_addresses')->initForm()->toHtml(),
        ));


        // load: Orders, Shopping Cart, Wishlist, Product Reviews, Product Tags - with ajax

        if (Mage::registry('current_customer')->getId()) {
            $this->addTab('orders', array(
                'label'     => Mage::helper('customer')->__('Orders'),
                'class'     => 'ajax',
                'url'       => $this->getUrl('*/*/orders', array('_current' => true)),
             ));

            $this->addTab('cart', array(
                'label'     => Mage::helper('customer')->__('Shopping Cart'),
                'class'     => 'ajax',
                'url'       => $this->getUrl('*/*/carts', array('_current' => true)),
            ));

            $this->addTab('wishlist', array(
                'label'     => Mage::helper('customer')->__('Wishlist'),
                'class'     => 'ajax',
                'url'       => $this->getUrl('*/*/wishlist', array('_current' => true)),
            ));

            $this->addTab('newsletter', array(
                'label'     => Mage::helper('customer')->__('Newsletter'),
                'content'   => $this->getLayout()->createBlock('adminhtml/customer_edit_tab_newsletter')->initForm()->toHtml()
            ));

            $this->addTab('reviews', array(
                'label'     => Mage::helper('customer')->__('Product Reviews'),
                'class'     => 'ajax',
                'url'       => $this->getUrl('*/*/productReviews', array('_current' => true)),
            ));

            $this->addTab('tags', array(
                'label'     => Mage::helper('customer')->__('Product Tags'),
                'class'     => 'ajax',
                'url'       => $this->getUrl('*/*/productTags', array('_current' => true)),
            ));
        }
        
        $this->_updateActiveTab();
        Varien_Profiler::stop('customer/tabs');
        return parent::_beforeToHtml();
    }

    protected function _updateActiveTab()
    {
        $tabId = $this->getRequest()->getParam('tab');
        if( $tabId ) {
            $tabId = preg_replace("#{$this->getId()}_#", '', $tabId);
            if($tabId) {
                $this->setActiveTab($tabId);
            }
        }
    }
}

---