MenuBar Component not accepting Tabindex

Im using the MenuBar Component of Vaadin 7.7.6 and its not accepting the Tabindex i want to set.
Heres my code:

MenuBar barmenu = new MenuBar(); MenuBar.MenuItem servs = barmenu.addItem("Services", null, null); servs.addItem("Car Service", null, null); armenu.setTabIndex(-1); column3.setComponent(barmenu); No matter what Tabindex i set (tried -2, -1 and >= 1) the Index always stays at 0. Is this a bug thats fixed in another Vaadin Version or is this behaviour intended?