IOS shows a specific gaming leaderboard

Question

How can I display a specific leaderboard in Game Center ?

My code is:

  GKGameCenterViewController *gameCenterController = [[GKGameCenterViewController alloc] init]; if (gameCenterController != nil) { gameCenterController.leaderboardIdentifier = @"leaderboard1"; gameCenterController.gameCenterDelegate = self; gameCenterController.viewState = GKGameCenterViewControllerStateLeaderboards; [self presentViewController: gameCenterController animated: YES completion:nil]; } 

I want to display only "leaderboard1", but it displays all the leaderboards. The Leaderboard ID is valid.

thanks