Cannot make x:dataList styleClass attribute work

[Randahl Fink Isaksen]

The documentation for the x:dataList says you can add a css style class 
to it, but I am unable to make that work. This is what I have:

                               <x:dataList
                                   id="tree-menu"
                                   styleClass="test"
                                   value="#{myBean.cBean.menuItems}"
                                   var="menuItem"
                                   layout="unorderedList"
                               >
I was expecting to see UL and LI elements with a style class attribute 
containing the value "test", but instead I get raw unstyled UL and LI 
tags like this:

<ul>
<li>Velkommen</li>
<li>Farvel</li>
</ul>

Had anyone had a similar problem?

Thanks

R.