According to the Zone component documentation page: http://tapestry.apache.org/current/apidocs/org/apache/tapestry5/corelib/components/Zone.html
The show\update attributes could have values enlisted by the "Tapestry.ElementEffect", I tried checking that object for all available values but javascript's console says its undefined. May be it has been renamed but it's new name isn't reflected in the docs ?
