i am using UIModalTransitionStylePartialCurl on the ios 4 device,in my test app i have 2 classes where a single button in each class, in first page onclick of the button it ill
You may well have added the Action twice in Interface Builder. Go to the ViewController and to the Triggered Segues on the right and "x" do delete the extra one. LOL
If you read the documentation for UIModalTransitionStylePartialCurl, you will see that once you've used it you can't present any more modal views.
If you want to navigate back, I think you should do,
[self dismissModalViewControllerAnimated:YES];
rather than creating a new view controller instance.