Steps to Reproduce

1. load attached zul
2. hover on the first menuitem
3. press down key twice to prove the keyboard selection works
4. move to the last item and move back to the first item
5. press down key twice

Current Result

can't move the menu selection by keyboard

Expected Result

users still can move the menu selection by keyboard

Debug Information

• when opening a sub-menupopup and close it, it doesn't return the focus to parent menupopup.
• include the js below to debug:

  /* print focus element periodically for debug */
  setInterval(function(){
      console.log(document.activeElement);
  }, 500);
  

Workaround

see attached js