I extends "SonataAdminBundle::standard_layout.html.twig and it show me admin theme without header/menu. After the debug code "admin_pool" is not defined I passed from admin_pool from the controller but still not defined.
Can you please tell me what am I missing?
I solved header's problem myself using below code
return $this->render('ProjectBundle:Controller:page.html.twig', array('admin_pool' => $admin_pool));