GTK Widgets drawing an undesired background

[Lovelace Luquette <luquette bu edu>]

Hi,

I've currently got a GTK theme engine which (rather uselessly) overrides 
every one of the draw_* functions from GtkStyleClass with functions that 
do nothing.  The exception to this is the draw_flat_box function, which is 
currently drawing a solid white box to the entire area denoted by the 
window.  In addition to the draw_* functions, I've also overridden the 
set_background function with a similar no-op function.

However, certain widgets are still managing to draw backgrounds; for 
example, the menu bar, any menus spawned from it and toolbars are all 
drawing solid black backgrounds.  I've looked around the GTK code, but 
each of these classes use the gtk_paint_box function to do all drawing 
(with the exception of some line drawing for the shadow type in the tool 
bar widget), which only performs some sanity checks on its arguments and 
then chains to my style's draw_box function.  So why are these widgets 
still somehow managing a black background, which must be applied _after_ 
draw_flat_box?  Is this a well-known behavior?  And is it correct?  Are 
there any ways to get around it?

Thanks,
Joe Luquette