NSToolbar experience?

Hi cocoa-dev, has anybody experience using NSToolbar and NSToolbarItems and can he/she provide some sample code or a path to code using these classes? I've read the AppKit Release Notes and believe that I did all that was required to get a toolbar on my window, but still I don't see much more than a horizontal line. How can get items on that toolbar (predefined or custom made)? Thanx, -A