UISearchDisplayController not showing

I've been doing everything programmatically in the past, but now I'm trying to learn to use Interface Builder. An experience in and of itself.

My problem is with UISearchDisplayController. Just dropping it on top of my UITableViewController (see figure 1) should set up all relevant connections (and I think add it to the tableView header), and as such it should (?) show up when I run the app. But no! Nothing shows up (see figure 2). Has anyone had any similar experiences, or know what the problem might be?

Figure 1

Figure 2

It's a navigation based app - if that makes any difference - with the navigation part of the app set up programmatically like so:

- (BOOL)application:(UIApplication *)application didFi开发者_C百科nishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    bookmarksController = [[BookmarksViewController alloc] init];
    bookmarksController.managedObjectContext = [self managedObjectContext];

    navController = [[UINavigationController alloc] initWithRootViewController:bookmarksController];
    [bookmarksController release];

    [self.window addSubview:navController.view];
    [self.window makeKeyAndVisible];

    return YES;
}

Turns out I had to explicitly point out which NIB to load:

bookmarksController = [[BookmarksViewController alloc] initWithNibName:@"BookmarksViewController" bundle:nil];

in the ViewDidLoad method:

self.searchDisplayController.searchBar.hidden = NO;

if that dosen't help then check all the connections in IB. This a screenshot of the connections of the Files Owner in my tableview xib.

If even this dosen't help, please comment and I will try to figure out something else.