Preference-apperance similar to Finder, Safari and Mail

When I click on items at the top of the toolbar (Safari) there is a nice fading and window-changing effect. I've seen this effect in a few third-party applications as well.

I'm wondering if there is a way to "duplicate" this effect in objective-c.

If BWToolkit doesn't do it for you, I've also written a selectable toolbar controller that you can find here on GitHub. My code is stable (and documented), but doesn't integrate with Interface Builder (it loads separate nibs for separate panes). Take a look at it, and see if it's right for you.

Check out BWToolklit. It's a 3rd party framework (with Interface Builder plugin) that includes this "BWSelectableToolbar" that does what you're looking for.