Chapter 5. Components

The Flex 4 SDK provides a set of classes and user interface (UI) components to facilitate rapid and standardized development. The fourth iteration of the SDK has been designed to enable the use of Flex 3 (Halo) components as well as Flex 4 (Spark) components based on the new architecture. By default, the Spark and Halo components are differentiated by the s and mx namespaces, respectively. For example:

<s:Button id="sparkButton"/>
<mx:Button id="haloButton"/>