Hi Serge,
Yes, you need to have the @RBUUID Annotation, the same value can be used in your action model files to refer to the resource files. For most of the OOTB resource file, you can find the source files in the Windchill installation directory.
e.g. <WT_HOME>\src\com\ptc\core\ui\navigationRB.java
Regards,
Bhushan