Changing a style property?

[Andrew Smith <asmith15 littlesvr ca>]

Hi

Can someone tell me how to change the 'style property' (as it's called 
in the reference manual) of a gtkwidget?

Specifically right now I'm looking to change the 'shadow-type' property 
of gtkmenubar, gtktoolbar, and gtkcombobox. They look like crap on vista.

I tried a g_object_set() but that says 'object class gtkmenubar has no 
property named shadow-type'.

I can't find anything in the manual describing how to work with style 
properties, only some vague references to themes here and there. I would 
prefer to not have a theme, but I will write one if I have to, in which 
case would you please point me to a guide or a reference?

Thanks in advance,

Andrew