The layer names you use in the original design document are brought into Flash Catalyst. These names are also reflected in the Flex code that gets generated by Flash Catalyst. This is the same code that will be used by Flex developers if the Flash Catalyst project file is imported into Flash Builder for additional development.
Use a consistent naming strategy throughout your design. For example, you could use “name_btn_up” and “name_btn_down” to specify artwork that will be turned into button components. It’s a good idea to agree on a naming convention with other designers and developers before beginning a project.