[pygtk] missing background image

[vibeesh p]

My problem is
the code below is used to set the background of the window ,it works well
but
when i am trying to open a dialog box such as filechooserdialog the
background disappears

        pixbuf =3D gtk.gdk.pixbuf_new_from_file ('mainframe.jpg')
        pixmap, mask =3D pixbuf.render_pixmap_and_mask()
        width, height =3D self.pixmap.get_size()
        del pixbuf
        window.set_app_paintable(True)
        window.resize (width, height)
        window.realize()
        window.window.set_back_pixmap(pixmap, False)
        del pixmap

Please help me
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