I'm trying to use an NSSplitView, and have had no luck finding an interface builder palette for it, and it doesn't seem to be built in. I can of course just add an NSView and set it to be an NSSplitView, but then I can't set any of it's parameters within IB.
However, I had a look at the NIBs for a couple of programs that use the split views, and they seem to have all the controls in Interface Builder for them - how can I do this?