TabbedPane needs a custom styleClass for the empty header cell

It would be nice to be able to customise the styleClass for the empty header cell so that you can have some tabs squashed over to the left and another set of tabs more spread out.

A practical example of why this is needed is if you want to nest two sets of tabs one inside the other and have the inner set of tabs appear like a menu bar rather than tabs you would prefer to have them spread out as opposed to the tabs which you would want squashed up currently there is only the class="myFaces_panelTabbedPane_emptyHeaderCell" default styleClass and no way of adding a custom one