facebook login using FBloginView not showing in ios 6

i am trying create login button for facebook using FBloginView. Following is the code i wrote. ``` - (void)viewDidLoad { [super viewDidLoad]; if(!loginview) loginview = [[FBLoginView alloc] initWithPermissions:[NSArray arrayWithObject:@"publish_actions, user_photos,status_update"]]; // Whatever permissions you need loginview.frame = self.view.bounds; //whatever you want loginview.delegate = self; [self.view addSubview:loginview]; // Do any additional setup after loading the view from its nib. } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } - (void)loginViewShowingLoggedInUser:(FBLoginView *)loginView { NSLog(@"Logged In"); } - (void)loginViewFetchedUserInfo:(FBLoginView *)loginView user:(id<FBGraphUser>)user { NSLog(@"user Id %@",user.id); } - (void)loginViewShowingLoggedOutUser:(FBLoginView *)loginView { // Called after logout NSLog(@"Logged out"); } ``` but its not showing login button. what is the problem with my code. in console am getting "Logged out".