Different text style in menu and button possible?

["Karl H. Beckers" <karl h beckers gmx net>]

Hello all,

am I right in supposing that you can't have a GTKLabel that's used
in a button behave differently from a Label in a Menu?

Thing is I'm in the process of creating a theme and would like to
have text in a prelighted menuitem white (dark bg) but black in a
button (bright bg).
Can't seem to find a way to do that. Is there one?

TIA,

Karl.