I read this doku and example under "http://docs.jboss.com/jbportal/v2.0Final/reference-guide/en/html/themeandlayouts.html". But it seems it is not the latest version, since it's about version 2.0 but I use 2.6-GA.

For example, it tels in the doc that one has to configure the "$PORTAL_HOME/portal-core.war/WEB-INF/default-portal.xml", but I couldn't find this file. Maybe it is different by different version?