Header Menu with submenus

Im having problems with a header menu. Maybe a bug or bugs.
The menu is place on the top and named Example and there
is also the submenu.
The menu reappears on the top right side. It reminds me of
an echo. Maybe a bug.
Also there are menus for viewing Front, Side and Top views but
for some reason they are disabled as seen.
Why are they disabled ?

Still trying. I placed a new menu below the the cube and above the cube.
The ones below work fine but the ones on the top dont. Strange.

Added the new menu items, undo and redo but they
are not working. They were working with a different version
just a couple of days ago but not with the current version.
CTRL + Z is also not working.