It looks like you can change the number color in the "new menus" by setting the
MPROP_NUMBER_COLOR property:
PHP Code:
menu_setprop(menu, MPROP_NUMBER_COLOR, "\r")
Obviously change the "\r" to one of the other valid colors mentioned by mlibre.
If you wanted to change them individually, I suspect you'd have to create the entire menu in the "old" menus method (the "new" menus are called "new" and the original method is often referred to as "old" but it would probably more apt to refer to the "old" as simply "advanced menus").