Not much beyond basic Visio automation
I bought this "book", which is about 2/3 diagrams, source code, and white space, to learn how to get details from a class diagram but it doesn't cover much beyond cycling through the shapes on a page. The author only states that details that do not appear on the screen cannot be accessed (such as the Documentation field of a class attribute). The author does very little to describe a "better design tool". Save your money and find free info on Visio Automation and Shapes and you'll probably get more useful info than this article provides. This is definitely way below the normal Wrox standards!