Learning Flex Basics (Part 1): Creating Your First Flex Application

"In this tutorial you will learn the basic elements of Macromedia Flex applications through an overview and through building a simplified catalog and shopping cart in MXML. To do this you will create an application, add a layout container, add controls, create a simple data model that is bound to controls, and finally create event-handler functions in ActionScript."

Macromedia : Developer Center - Learning Flex Basics (Part 1): Creating Your First Flex Application