Xcode update?/can't replicate example in Stanford Lecture 1

Hi,

Does anyone know when Xcode was last updated?

Just got my MacBook Pro (w/snow leopard) last week and I just started working through the Stanford CS193P course.

I couldn't replicate the SliderTest in Lecture 1 because the inspector window for the NSObject does not allow definition of class action and events like on the instructor's screen in Lecture 1.

I was able to load the class example program fine but I want to know how to build it and follow along with the class examples. When I load the class example program its apparent that the software was updated because the information displays differently.

Thanks,