'Control outline settings.
Args:
outline_on:    Outlines are visible. Optional, defaults to True.
outline_below: Show row outline symbols below the outline bar.
Optional, defaults to True.
outline_right: Show column outline symbols to the right of the
outline bar. Optional, defaults to True.
outline_style: Use Automatic style. Optional, defaults to False.
Returns:
0:  Nothing.'

def outline_settings(self, outline_on=1, outline_below=1, outline_right=1, outline_style=0):

    self.outline_on = outline_on
    self.outline_below = outline_below
    self.outline_right = outline_right
    self.outline_style = outline_style
    self.outline_changed = True
