[iPhone] Calc.app builds fine, but doesn't work as intended

Hi,
Trying the Calc example in "Xcode Quick Tour for iPhone OS", I end up with an application that builds and launches fine in the iPhone Simulator, but that doesn't work.
Did anyone try this example and did it work for you ?
Here is what I observed :
When I press a digit, the displayField's value isn't changed.
Going in debug, I can see that the instance of the Calculator class does receive a message with the "input" selector and with the parameter "character" worth the digit that I pressed. The [_diplay appendString:character], but _display seems to keep being "nil".
Any idea ?
Many thanks in advance for your help,
J.

The Calc example worked well for me. The only bugginess I found was that if the text field is forced to reduce it's font size it never gets reset to the original size.
Assuming you didn't touch the Calculator class files it's probably something simple. Check the IB connections, especially the connection between the displayField outlet and the UITextField. Maybe put a NSLog in the press method to check \[_calculator display\]. Of course if your Calculator class files are different from mine all bets are off, so if you don't have any luck we'll need to compare those.

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