Run attached code sample - there are next problems:
1. calling MenuBar#getMenus().remove() deletes menu subitems nstead
2. MenuBar#getMenus().remove(0) deletes items in all menus
3. MenuBar#getMenus().removeAll() deletes items in first menu item
1. calling MenuBar#getMenus().remove() deletes menu subitems nstead
2. MenuBar#getMenus().remove(0) deletes items in all menus
3. MenuBar#getMenus().removeAll() deletes items in first menu item