Book excerpt: * Learn the new, powerful features in the new release of Flash. Covers all new areas of extensibility: commands, tools, timeline effects, behaviors, and advanced topics. This book will allow you to streamline day-to-day development by showing you how to custom-build your own commands and tools. Plenty of useful examples are included throughout to demonstrate each area. * Two books in one: first part will actually get the person to understand and be able to use the Extensibility features, not just copy and paste the code in the book, but have a conceptual understanding of how it works and be able to create their own extensions. The second part of the book will be a complete reference guide, that one will want to keep around to look up commands, syntax, parameters, etc. * At this time, it’s the only book covering the subject, and this book actually covers extensibility in both Flash MX 2004 and Flash MX Professional 2004. * The reference content and example files will be available from the book’s companion site, www.flashextensibility.com – this site aims to be the premier site for designers and developers to go to for Flash extensibility material.