tabbar controller how to add an option?

Only two options can click Default
Reply:
If the IB settings, you can set its properties viewControls (forgot the name)
Xcode or tabBarController.viewControllers = controls;
controls for the view controller array

Reply:

 NSMutableArray * tabControllers = [[NSMutableArray alloc] initWithObjects: 
[ViewControllers1 objectAtIndex: 0], 
[ViewControllers2 objectAtIndex: 1], 
[ViewControllers3 objectAtIndex: 2], 
[ViewControllers4 objectAtIndex: 3], nil]; 
[TabBarController setViewControllers: tabControllers]; 
[TabControllers release]; 

Reply:
The property is set in IB points that can add the + sign on the line