app/code/core/Mage/Adminhtml/Block/Permissions/Grid/Role.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)
 */

/**
 * roles grid
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Permissions_Grid_Role extends Mage_Adminhtml_Block_Widget_Grid
{
    public function __construct()
    {
        parent::__construct();
        $this->setId('roleGrid');
        $this->setSaveParametersInSession(true);
        $this->setDefaultSort('role_id');
        $this->setDefaultDir('asc');
        $this->setUseAjax(true);
    }

    protected function _prepareCollection()
    {
        $collection =  Mage::getModel("admin/roles")->getCollection();
        $this->setCollection($collection);

        return parent::_prepareCollection();
    }

    protected function _prepareColumns()
    {

        $this->addColumn('role_id', array(
            'header'    =>Mage::helper('adminhtml')->__('ID'),
            'index'     =>'role_id',
            'align'     => 'right',
            'width'    => '50px'
        ));

        $this->addColumn('role_name', array(
            'header'    =>Mage::helper('adminhtml')->__('Role Name'),
            'index'     =>'role_name'
        ));

        return parent::_prepareColumns();
    }

    public function getGridUrl()
    {
        return $this->getUrl('*/*/roleGrid', array('_current'=>true));
    }

    public function getRowUrl($row)
    {
        return $this->getUrl('*/*/editrole', array('rid' => $row->getRoleId()));
    }
}

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