Changing an NSView in Xcode 3

Hey there, I'm pretty new to progamming for the mac and I'm having a pretty hard time with Xcode 3. It seems that most of the tutorials and example code out there is aimed at earlier versions of Xcode and there aren't many books for it as well. I come from programming in non GUI environments and have experience in Pascal, Assembler and C to name a few. I also took a paper on OOP using Java at University.
My question is pretty simple I think... I'm trying to write a simple program in Xcode 3 that changes the UI.. so you start with a screen with a button, the user clicks it and the screen changes to another with different buttons. I've seen examples of this for the iphone, which I've tried to modifie to work, on this forum as well as demos for Xcode 2.. I just want to do it for OSX.
Can anyone help? It's really, really frustrating trying to learn on Xcode 3.

Ok, so I get that I need to create another NSView nix file with the second UI in it and I think I can load it... but how do I make it visible instead of the UI created with the main nix?

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