gtktreeview bug or feature?

[edscott wilson garcia <edscott xfce org>]

I've noticed that with gtk-2.4 (gentoo) while the mouse cursor goes over
the expander of a row in a treeview, the expander changes to white (in
gtk2.2 it would change to black). 

Is this a bug or a feature? I suppose it is a feature if you could
select the color you wish to use to indicate the mouse is over the
expander, but I have not found out how to do so.

Edscott Wilson Garcia