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AS3 is a robust language with significant breadth and depth. It also has a learning curve steeper than those associated with other versions of ActionScript. In this author's humble opinion, it's unrealistic to cover both the Flash authoring application and the ActionScript language simultaneously with any degree of effectiveness.
As such, this book is one of a pair that has been conceived to focus on these two areas of interest. Each volume is organized to make it easy to acquire and digest the material most appropriate for your needs. The book you're reading now focuses primarily on the Flash authoring application, while its companion volume, Learning ActionScript 3.0, focuses almost exclusively on ActionScript.