How to make newly added main menu option in magento admin section "selected"

I have developed a new custom extension for mag开发者_如何学Cento admin section. Main menu option of this extension in admin section is visible. When I click on that menu option, functionality of this extension is working as per development/expected. But on this menu option "active" class is not being applied ( so that user can differentiate other menu option with this selected menu ).

There is no submenu under this main menu option. How can I apply "active" class on that menu option when this is clicked.

Thanks in advance!

You should use Mage_Adminhtml_Controller_Action::_setActiveMenu($menuPath) method. For more details you can check Mage_Adminhtml_Cms_PageController::_initAction().