Styles and themes

Styles are useful for defining the look and feel of your applications built with Adobe® Flex®. You can use them to change the appearance of a single component, or apply them across all components.

Adobe recommends

Introducing Styling and Skinning

Trilemetry
Adobe TV hosts a Flex in a Week training video that introduces the concepts of styling and skinning.

Flex 4 deemphasizes the use of style properties for some tasks. Instead of styling individual components, or classes of components, you can use custom skins to perform most operations that change the look and feel of your applications. This includes adding background colors and images, borders, and other properties that were styleable in Flex 3 applications. For more information on skinning, see Spark Skinning.