NSBrowser confusion

So, I've recently started learning to use XCode, and one thing I want to add to my application is a browser that allows the user to click an item in one column and get a list of items to select in the next column (that is, like the Finder's browser).

In order to do this, I figured I should use NSBrowser. After crawling through the documentation and various web boards, including Apple's SimpleBrowser example, I find that I still have no idea how to actually implement the browser.

Heres what I have so far:

A browser created in interface builder - just the NSBrowser object, nothing else (is anything else needed?)

a class in xcode for the delegate

an NSMutableDictionary for the entries in the first column

I have two main questions:

How do I get the data from the NSMutableDictionary (or an NSSet, or an NSArray - any will work) to the column of the browser?

How do I connect another list of data to a specific entry in the column (so that it will show when that entry is selected)?


Preferably, I'd like to use the item-based API that Apple introduced, although anything is fine at this point. Can anyone help me?