<action name="aboutAction" label="_About This Document Editor">
<class>AboutAction</class>
</action>It is a custom action implemented by Java™ class AboutAction (code contained in ) which displays our custom About dialog box.XXE_install_dir/doc/gui/tutorial/custom_parts.jar
Naming our action "aboutAction", just like the standard action "aboutAction" found in default.xxe_gui, suffice to do the job.