app/code/core/Mage/Adminhtml/Block/Sales/Order/View/Tab/Invoices.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)
 */

/**
 * Order Invoices grid
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Sales_Order_View_Tab_Invoices
    extends Mage_Adminhtml_Block_Widget_Grid
    implements Mage_Adminhtml_Block_Widget_Tab_Interface
{
    public function __construct()
    {
        parent::__construct();
        $this->setId('order_invoices_grid');
        $this->setUseAjax(true);
    }

    protected function _prepareCollection()
    {
        //TODO: add full name logic
        $collection = Mage::getResourceModel('sales/order_invoice_collection')
            ->addAttributeToSelect('order_id')
            ->addAttributeToSelect('increment_id')
            ->addAttributeToSelect('created_at')
            ->addAttributeToSelect('state')
            ->addAttributeToSelect('grand_total')
            ->addAttributeToSelect('base_grand_total')
            ->addAttributeToSelect('store_currency_code')
            ->addAttributeToSelect('base_currency_code')
            ->addAttributeToSelect('order_currency_code')
            ->joinAttribute('billing_firstname', 'order_address/firstname', 'billing_address_id', null, 'left')
            ->joinAttribute('billing_lastname', 'order_address/lastname', 'billing_address_id', null, 'left')
            ->addExpressionAttributeToSelect('billing_name',
                'CONCAT({{billing_firstname}}, " ", {{billing_lastname}})',
                array('billing_firstname', 'billing_lastname'))
            ->setOrderFilter($this->getOrder())
        ;
        $this->setCollection($collection);
        return parent::_prepareCollection();
    }

    protected function _prepareColumns()
    {
        $this->addColumn('increment_id', array(
            'header'    => Mage::helper('sales')->__('Invoice #'),
            'index'     => 'increment_id',
            'width'     => '120px',
        ));

        $this->addColumn('billing_name', array(
            'header' => Mage::helper('sales')->__('Bill to Name'),
            'index' => 'billing_name',
        ));

        $this->addColumn('created_at', array(
            'header'    => Mage::helper('sales')->__('Invoice Date'),
            'index'     => 'created_at',
            'type'      => 'datetime',
        ));

        $this->addColumn('state', array(
            'header'    => Mage::helper('sales')->__('Status'),
            'index'     => 'state',
            'type'      => 'options',
            'options'   => Mage::getModel('sales/order_invoice')->getStates(),
        ));

        $this->addColumn('base_grand_total', array(
            'header'    => Mage::helper('customer')->__('Amount'),
            'index'     => 'base_grand_total',
            'type'      => 'currency',
            'currency'  => 'base_currency_code',
        ));

        return parent::_prepareColumns();
    }

    /**
     * Retrieve order model instance
     *
     * @return Mage_Sales_Model_Order
     */
    public function getOrder()
    {
        return Mage::registry('current_order');
    }

    public function getRowUrl($row)
    {
        return $this->getUrl('*/sales_order_invoice/view',
            array(
                'invoice_id'=> $row->getId(),
                'order_id'  => $row->getOrderId()
            )
        );
    }

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


    /**
     * ######################## TAB settings #################################
     */
    public function getTabLabel()
    {
        return Mage::helper('sales')->__('Invoices');
    }

    public function getTabTitle()
    {
        return Mage::helper('sales')->__('Order Invoices');
    }

    public function canShowTab()
    {
        return true;
    }

    public function isHidden()
    {
        return false;
    }
}

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