app/code/core/Mage/Adminhtml/Block/Extensions/Mass/Upgrade.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)
 */

/**
 * Cache management form page
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Extensions_Mass_Upgrade extends Mage_Adminhtml_Block_Widget_Form
{

    public function initForm()
    {
        $this->setTitle('Upgrade packages');
        $this->setTemplate('extensions/mass/upgrade.phtml');

        return $this;
    }

    public function getUpgradeAllButtonHtml()
    {
        $html = '';

        $html .= $this->getLayout()->createBlock('adminhtml/widget_button')->setType('button')
            ->setClass('add')->setLabel($this->__('Upgrade all packages'))
            ->setOnClick("upgradeAll()")
            ->toHtml();

        return $html;
    }

    public function getBackButtonHtml()
    {
        $html = '';

        $html .= $this->getLayout()->createBlock('adminhtml/widget_button')->setType('button')
            ->setClass('back')->setLabel($this->__('Back to local packages'))
            ->setOnClick("setLocation('" . $this->getUrl('*/extensions_local') . "')")
            ->toHtml();

        return $html;
    }

}

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