The Kendo UI Toolbar widget supports adding SplitButtons that can contain several options. By default, the dropDown with the options can be opened using ALT+DOWN when the SplitButton is focused. This works as expected. According to the documentation, pressing UP or DOWN should now move the focus to the next or previous item. This happens internally, but there is no visual clue for the user. It is impossible to know which item is currently selected.
This DOJO demonstrates the bug.