getting default user interface from GKPeerPickerController class

Question

i am developing an application which needs bluetooth conection of two iPhones.Now this is what i did:

I created a view based application I included GameKit Framework in my application. I did not do anything to my app delegate file and in my view controller's view did load method i wrote folowing piece of code

[super viewDidLoad];

 mPicker=[[GKPeerPickerController alloc] init];
 mPicker.delegate=self;
 mPicker.connectionTypesMask = GKPeerPickerConnectionTypeNearby;
 mPeers=[[NSMutableArray alloc] init];
 mPicker.show;

now i expected the default interface to be shown when my application is launched because this is what is written in my didFinishLaunchingWithOption method of applicationdelegate

 [window addSubview:viewController.view];
 [window makeKeyAndVisible];

 return YES;

what else i need to do to make the defaultinterface visible.I have implemented delegate methods of GKPeerPickerController.

Thanks in advance....