protected function _prepareLayout() { $this->addButton('back', array('label' => Mage::helper('adminhtml')->__('Back'), 'onclick' => 'setLocation(\'' . Mage::helper('adminhtml')->getUrl('*/*/') . '\')', 'class' => 'back', 'level' => -1), 0, 100, 'header'); return parent::_prepareLayout(); }