.. versionadded:: 0.11.3

def on_canvas_slave__routes_set(self, slave, df_routes):
        '''
        .. versionadded:: 0.11.3
        '''
        self.canvas_slave.set_surface('routes',
                                      self.canvas_slave.render_routes())
        self.canvas_slave.cairo_surface = flatten_surfaces(self.canvas_slave
                                                           .df_surfaces)
        gtk.idle_add(self.canvas_slave.draw)