[PyQt] pyqt4, qt4 and stylesheets

[José M. Rodriguez Bacallao]

hi folks, I am developing an application with  pyqt4. I am trying to
achieve the same look in all platform using stylesheets, for axample,
I need that my toolbar look the same (with a background image
repeating in x direction) in gnome, kde, xfce, windows and mac but
right now I am facing a problem, when I start my application under,
for example, XFCE using greybird as gtk 2/3 style, my toolbar is using
the background from greybird theme, not from my stylesheet and when
staring from kde 4.8, the dockwidgets are using some hints from the
current kde style. So, my question is: how to achieve the same look in
all platforms?