I'm trying to...what "section header menu items" are you referring to?
Weird... looks like only Carbon has those. You can see them, for
example, in the Apple menu's "Recent Items" submenu. They essentially
look and behave like disabled menu items, but in Carbon you can set a
flag on any menu item to get this look, and it's a different flag
than the enable state.
Anyway, I'd suggest you just use disabled menu items for now, and
then use different indentation levels for your menu items to achieve
the proper look. There's already an established look for such items
in the OS, and it isn't selectable grey items or disabled black items.
