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

/**
 * Invoice view  comments form
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Sales_Order_Comments_View extends Mage_Adminhtml_Block_Template
{
    /**
     * Retrieve required options from parent
     */
    protected function _beforeToHtml()
    {
        if (!$this->getParentBlock()) {
            Mage::throwException(Mage::helper('adminhtml')->__('Invalid parrent block for this block'));
        }
        $this->setEntity($this->getParentBlock()->getSource());
        parent::_beforeToHtml();
    }

    /**
     * Prepare child blocks
     *
     * @return Mage_Adminhtml_Block_Sales_Order_Invoice_Create_Items
     */
    protected function _prepareLayout()
    {
        $button = $this->getLayout()->createBlock('adminhtml/widget_button')
            ->setData(array(
                'id'      => 'submit_comment_button',
                'label'   => Mage::helper('sales')->__('Submit Comment'),
                'class'   => 'save'
            ));
        $this->setChild('submit_button', $button);

        return parent::_prepareLayout();
    }

    public function getSubmitUrl()
    {
        return $this->getUrl('*/*/addComment',array('id'=>$this->getEntity()->getId()));
    }

    public function canSendCommentEmail()
    {
        switch ($this->getParentType()) {
            case 'invoice':
                return Mage::helper('sales')->canSendInvoiceCommentEmail($this->getEntity()->getOrder()->getStore()->getId());
            case 'shipment':
                return Mage::helper('sales')->canSendShipmentCommentEmail($this->getEntity()->getOrder()->getStore()->getId());
            case 'creditmemo':
                return Mage::helper('sales')->canSendCreditmemoCommentEmail($this->getEntity()->getOrder()->getStore()->getId());
        }

        return true;
    }
}

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