Flex 4 is the new update from Adobe on their highly successful Flex product and this book takes a generation of Flex developers to the advanced and professional best practices in the industry. Flex is becoming more and more important to Adobe, and a lot of Web developers will be migrating their skills from Flash to Flex, and looking to learn some advanced techniques. As the size of the Flex market continues to expand and gain experience, so does the need for a book that covers all the capabilities and advanced concepts. Adobe Flex is the tool of choice for developers of rich internet applications with Web 2.0 interactivity. Version 4 brings advanced new tools and concepts to an already capable product.