How do developers actually use it?
The Text Layout Framework is not built into Flash Player. Rather, it is an independent component library written entirely in ActionScript 3.0 and is designed for use with both Flash CS4 and Flex 4 beta. The TLF library contains about one hundred classes and interfaces organized into ten packages. Because the framework is extensible, it can be customized for specific environments. Both Flash CS4 and Flex 4 beta provide custom components that are based on the framework. For Flash CS4 you can download a pre-release version of a customized textLayout component. Once it is installed, you can drag-and-drop a text component on to the stage. Similarly, for Flex 4 beta, you can use the new TextArea component, which is based on the framework. Alternatively, if you prefer to work with pure code, you can place the non-customized version of the textLayout component into your library path for Flash CS4, Flex 4 beta, or even Flex 3.2. This will make the framework’s code available to your application.