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Mage::dispatchEvent('tnw_salesforce_sales_order_status_new_status_prepare_form', array('form' => $_form));

<?xml version="1.0"?>
<config>
    <global>
        <events>
            <tnw_salesforce_sales_order_status_new_status_prepare_form>
                <observers>
                    <tnw_salesforce_order_new_status_update>prepare_form>
                        <class>tnw_salesforce/observer</class>
                        <method>updateOrderStatusForm<<method>orderNewStatusPrepareForm</method>
                    </tnw_salesforce_order_new_status_prepare_update>form>
                </observers>
            </tnw_salesforce_sales_order_status_new_status_prepare_form>
        </events>
    </global>
</config>

<?php

/**
 * Class TNW_Salesforce_Model_Observer
 */
class TNW_Salesforce_Model_Observer
{
 
    public function updateOrderStatusFormorderNewStatusPrepareForm($observer) {
		/** @var Varien_Data_Form $_form */
		$_form = $observer->getForm();
 
        // Your custom code
    }
 
}