Xcode and IB NSApplication help

In xcode I've made a Cocao application project and subclassed NSView (based off apple opengl tutorial). In IB, i've placed a custom NSView in my window and set the class to the name of my subclass. Everything compiles fine, but my subclassed NSView is never entered at runtime. I must not be understanding how to connect NSApplication with my window and view. I can post my code if needed. Thanks for your help, -Tobey