[gtkmm] ImageMenuElem again

[Diana Esch-Mosher <desch-mosher lanl gov>]

So I know that buttons can be packed with a pixmap and text and the
OptionMenu is just a button and menu. Why is it that an ImageMenuElem's
image is not displayed when selected, only the associated text. Is there
a flag somewhere I don't have set or is this a bug? If OptionMenu
properly displayed the image and the text upon selection my life would
be a whole lot easier!

Thanks,
-- 
Diana Esch-Mosher <desch-mosher lanl gov>
Los Alamos National Laboratory