CA not shows proposals for #{cc.attrs.|}

#1 import https://svn.jboss.org/repos/jbosstools/trunk/jsf/tests/org.jboss.tools.jsf.vpe.jsf.test/resources/jsf2test
#2 open page https://svn.jboss.org/repos/jbosstools/trunk/jsf/tests/org.jboss.tools.jsf.vpe.jsf.test/resources/jsf2test/WebContent/resources/rich/page.xhtml
#3 there exist defined attributes for this components via <composite:attribute name="sidebarClass"/>
#4 user can reffer to this attributes using following structure #

#5 when we call CA #{cc.attrs.| there no proposals of attributes.
I don't know is it expected to work. But if not implemented than change BUG to FR.