[pygtk] Aligning Image in Buttons

[Xenofon Papadopoulos]

I'm displaying an image in a button, like this:

        def set_button_icon( self, btn, fname, width = 40, height = 40 ):
                pb = gtk.gdk.pixbuf_new_from_file( fname )
                pb = pb.scale_simple( width, height, gtk.gdk.INTERP_BILINEAR
)
                img = gtk.Image()
                img.set_from_pixbuf( pb )
                btn.set_label( '' )
                btn.set_image( img )

where btn is a gtk.Button
However the image is drawn beginning from the top left corner of the button.
How can I align it to the center?
Thanks
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