app/code/core/Mage/Adminhtml/Block/Catalog/Product/Edit/Tab/Price/Tier.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 tier pricing item renderer
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Catalog_Product_Edit_Tab_Price_Tier extends Mage_Adminhtml_Block_Widget implements Varien_Data_Form_Element_Renderer_Interface
{

    protected $_element = null;
    protected $_customerGroups = null;
    protected $_websites = null;

    public function __construct()
    {
        $this->setTemplate('catalog/product/edit/price/tier.phtml');
    }

    public function getProduct()
    {
        return Mage::registry('product');
    }

    public function render(Varien_Data_Form_Element_Abstract $element)
    {
        $this->setElement($element);
        return $this->toHtml();
    }

    public function setElement(Varien_Data_Form_Element_Abstract $element)
    {
        $this->_element = $element;
        return $this;
    }

    public function getElement()
    {
        return $this->_element;
    }

    public function getValues()
    {
        $values =array();
        $data = $this->getElement()->getValue();

        if (is_array($data)) {
            usort($data, array($this, '_sortTierPrices'));
            $values = $data;
        }
        return $values;
    }

    protected function _sortTierPrices($a, $b)
    {
        if ($a['website_id']!=$b['website_id']) {
            return $a['website_id']<$b['website_id'] ? -1 : 1;
        }
        if ($a['cust_group']!=$b['cust_group']) {
            return $this->getCustomerGroups($a['cust_group'])<$this->getCustomerGroups($b['cust_group']) ? -1 : 1;
        }
        if ($a['price_qty']!=$b['price_qty']) {
            return $a['price_qty']<$b['price_qty'] ? -1 : 1;
        }
        return 0;
    }

    public function getCustomerGroups($groupId=null)
    {
        if (!$this->_customerGroups) {
            $collection = Mage::getModel('customer/group')->getCollection()
                ->load();
            $this->_customerGroups = array(
                Mage_Customer_Model_Group::CUST_GROUP_ALL => Mage::helper('catalog')->__('ALL GROUPS'),
            );
            foreach ($collection->getIterator() as $item) {
                $this->_customerGroups[$item->getId()] = $item->getCustomerGroupCode();
            }
        }
        return is_null($groupId) ? $this->_customerGroups :
            (isset($this->_customerGroups[$groupId]) ? $this->_customerGroups[$groupId] : null);
    }

    public function getWebsiteCount()
    {
        return count($this->getWebsites());
    }

    public function isMultiWebsites()
    {
        return !Mage::app()->isSingleStoreMode();
    }

    public function getWebsites()
    {
        if (!is_null($this->_websites)) {
            return $this->_websites;
        }
        $websites = array();
        $websites[0] = array(
            'name'      => $this->__('All Websites'),
            'currency'  => Mage::app()->getBaseCurrencyCode()
        );
        if (Mage::app()->isSingleStoreMode() || $this->getElement()->getEntityAttribute()->isScopeGlobal()) {
            return $websites;
        }
        elseif ($storeId = $this->getProduct()->getStoreId()) {
            $website = Mage::app()->getStore($storeId)->getWebsite();
            $websites[$website->getId()] = array(
                'name'      => $website->getName(),
                'currency'  => $website->getConfig(Mage_Directory_Model_Currency::XML_PATH_CURRENCY_BASE),
            );
        }
        else {
            $websites[0] = array(
                'name'      => $this->__('All Websites'),
                'currency'  => Mage::app()->getBaseCurrencyCode()
            );
            foreach (Mage::app()->getWebsites() as $website) {
                if (!in_array($website->getId(), $this->getProduct()->getWebsiteIds())) {
                    continue;
                }
                $websites[$website->getId()] = array(
                    'name'      => $website->getName(),
                    'currency'  => $website->getConfig(Mage_Directory_Model_Currency::XML_PATH_CURRENCY_BASE),
                );
            }
        }
        $this->_websites = $websites;
        return $this->_websites;
    }

    public function getDefaultCustomerGroup()
    {
        return Mage_Customer_Model_Group::CUST_GROUP_ALL;
    }

    protected function _prepareLayout()
    {
        $this->setChild('add_button',
            $this->getLayout()->createBlock('adminhtml/widget_button')
                ->setData(array(
                    'label'     => Mage::helper('catalog')->__('Add Tier'),
                    'onclick'   => 'tierPriceControl.addItem()',
                    'class' => 'add'
                )));
        return parent::_prepareLayout();
    }

    public function getAddButtonHtml()
    {
        return $this->getChildHtml('add_button');
    }

    /**
     * Returns customized price column header
     * that was seted through set...
     *
     * @param string $default
     * @return string
     */
    public function getPriceColumnHeader($default)
    {
        if ($this->hasData('price_column_header')) {
            return $this->getData('price_column_header');
        } else {
            return $default;
        }
    }
}

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