hbox.pack_start(button, expand = True, fill = True, padding = 3)
vbox.pack_start(hbox, expand = False, fill = True, padding = 3)
self.pack_start(vbox, expand = True, fill = True, padding = 3)
hbox.pack_start(button, expand = True, fill = True, padding = 3)
vbox.pack_start(hbox, expand = False, fill = True, padding = 3)
self.pack_start(vbox, expand = True, fill = True, padding = 3)