iOS Page Curl Help?

[iLoveDeveloping]

Hi,

Just making a screen transition and can't get the page curl to work!

First question is, are Apple allowing page curl yet? Because i have seen a few Apps rejected on the grounds that they were using private API for Curl Transitions.

And second, what am i doing wrong? Can anyone suggest some code instead of what im doing, are there any alternatives that have been approved by Apple?

My Code:

- (IBAction)gotoFirstView{
	firstViewController.modalTransitionStyle = UIViewAnimationTransitionCurlUp;
	[self presentModalViewController:firstViewController animated:YES];
}

PS Its not working on my device or iPhone simulator. (But it works perfect when run in the "New" simulator.)