thank you for your feedback. I think it's a bug in documentation, we will investigate it.
thanks for the answer.
How can I use a facet (in the documentation for example headerExpandedClass) to style a component?
The best way to style collapsible panel is to redefine RichFaces CSS classes assigned to the component, e.g.:
- .rf-cp-hdr-exp for header when the panel is expanded
- .rf-cp-hdr-colps for header when the panel is collapsed
You can find list of usable CSS classes in Component Reference (http://docs.jboss.org/richfaces/nightly_4_0_X/Component_Reference/en-US/html_single/#sect-Component_Reference-richcollapsiblePanel-Style_classes_and_skin_parameters).