$this->addTab('tab_id', array( 'label' => 'Tab Label', 'title' => 'Tab Title', 'content' => 'Tab content goes here', 'active' => true, ));
$this->setDestElementId('content'); $this->setTitle('Tab Title'); $this->setTemplate('tab.phtml');This code sets the destination element ID, the tab's title, and the template that should be used to render the tab. Package Library: Magento Adminhtml