Set gc_light/dark color using resource?

[jos <josvanr xs4all nl>]

HI!!!

When gtk draws a 'raised' button of a certain
background color, it draws the top and left edges
in a somewhat lighter color (gc_light) and the
bottom and right edges in a somewhat darker color
(gc_dark). Is it possible to set these colors 
explicitly? In the .gtkrc file I can only find
entries for the background color. 

best regards

jos van riswick