ActionScript for Flash MX: The Definitive Guide, 2nd Edition By Colin Moock
Chapter 13. Movie Clips
13.12 Onward!
We've come so far that there's not much more to move on to! Once you understand objects and movie clips thoroughly, you can tackle most ActionScript projects on your own. But there's still some interesting ground ahead. Chapter 14 shows how to create MovieClip subclasses and components, such as the UI Components shipped with Flash MX.