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// Magento version <= v1.6

// IMPORTANTE: LIMPIAR CACHE, SESSION PARA PODER ACCEDER URL /////////

//Llamada a la url 

 $this->getMassactionBlock()->addItem('export_shipments3', array(
            'label'=> Mage::helper('sales')->__('Export'),
            'url'  => $this->getUrl('example/index/export',array('_current'=>true)),
));
        
// Definicion en el config

<admin>
    <routers>
        <devopenexample>
            <use>admin</use>
            <args>
                <module>Devopensource_Example</module>
                <frontName>example</frontName>
            </args>
        </devopenexample>
    </routers>
</admin>
    
// Ruta al controller:

// path: controllers/IndexController.php

// URL FINAL: 

/example/index/export/key/fd1bbeeb040970708a1092e79ec21c35/