drawing GtkEntry

[Davina Armstrong <davina lickey com>]

I'm trying to change the appearance of GtkEntry to be a dotted underline
rather than a white box.  I've got the dotted line being drawn, but I
can't figure out where the white rectangle is being drawn.  I was able
to draw a gray box *over* the white one, but I'd prefer not to draw the
white one in the first place.  Help, anyone?

Thanks!
Davina