'Fill frame with buttons tied to other options.'

def create_other_buttons(self):

    f = self.make_frame('Direction')
    btn = Radiobutton(f, anchor='w', variable=self.engine.backvar, value=1, text='Up')
    btn.pack(side='left', fill='both')
    if self.engine.isback():
        btn.select()
    btn = Radiobutton(f, anchor='w', variable=self.engine.backvar, value=0, text='Down')
    btn.pack(side='left', fill='both')
    if (not self.engine.isback()):
        btn.select()
