[iPhone] Pinch/zoom in UIScrollView at simulator does not work

Hi everyone,
I tried to get pinch/zoom working for a UIImageView within a UIScrollView. Therefore I downloaded the source code from the tutorial under http://www.vimeo.com/1642150. When I started the app in the iPhone simulator I used the options key and the mouse pad to simulate zoom/pinch gesture, but nothing happend (the two gray circles are shown in the simulator which indicates that zoom/pinch gesture is used for input). The zoom/pinch does not work within the UIScrollView, whatever I try, nothing worked. None of the UIScrollView delegate methods are called (used NSLog to check it). Did anybody has a similar problem or behaviour?
Thanks for help.

Thanks for the reply. I finally found the problem. You have to use two fingers and the options key to simulate zoom/pinch gestures with a trackpad, although the two gray circles are shown when use only one finger, zoom/pinch only works if you use two finger, like you would do for scrolling.

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