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Tab bar seems to be locked (default settings)
// Create the main tabbar controller
tabbarController = [[UITabBarController alloc] init];

// Create the first view controller
MyFirstViewController *v1 = [[MyFirstViewController alloc] initWithNibName:@"MyfirstViewController" bundle:nil];
[v1 setTitle:@"Tab1"];

// Create second view controller
MySecondViewController *v2 = [[MySecondViewController alloc] initWithNibName:@"MySecondViewController" bundle:nil];
[v2 setTitle:@"Tab2"];

// Make an array of controllers for the tabbar
NSArray *tabbarControllerArray = [NSArray arrayWithObjects:v1, v2, nil];

// Set the view controllers used by the tabbar controller
[tabbarController setViewControllers:tabbarControllerArray];

// Release views (retained elsewhere)
[v1 release];
[v2 release];

// Add the controller to the subview
[window addSubview:[tabbarController view]];

// Make key and visible
[self.window makeKeyAndVisible];