Interface Builder was impossible in the C++s of the day. It is merely extremely difficult today. Remember that what IB did was build the UI using the actual e

Interface Builder was impossible in the C++s of the day. It is merely extremely difficult today. Remember that what IB did was build the UI using the actual elements, so you could play with it even without the logic hooked up, serialized that entire object tree, and then deserialized it at runtime.