Steps to Reproduce

https://zkfiddle.org/sample/14k1lku/1-can-t-focus-navbar
change focus using the buttons at the bottom

Current Result

textbox and button receive focus as expected
navbar doesn't get focussed (also individual navitem doesn't get focussed)

Expected Result

navbar can be focussed programmatically

Debug Information

using TAB key the navbar is focussable as expected

Workaround