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class Usedb extends CI_Controller {
	function __construct() {
		parent::__construct();
	}
	
	function index() {
		$this->load->library('session');
		$vars = array('page_title' => 'Use Database','layout'=>'main');
		$page_init = array('location' => 'usedb');
		$this->fuel->pages->render('', $vars, $page_init);
	}
}
Comments
$page_init = array('location'=>'usedb','render_mode'=>'view'); $this->fuel->pages->render('usedb', $vars, $page_init);and a test "usedb.php" view, I have had some success - my test view appears with the "main" view's header & footer blocks.