```
    @Slot(bool)
    def showGrid(self, grid):
        print('show grid')
        if grid:
            self.machine_actor.DrawXGridlinesOn()
            self.machine_actor.DrawYGridlinesOn()
            self.machine_actor.DrawZGridlinesOn()
        else:
            self.machine_actor.DrawXGridlinesOff()
            self.machine_actor.DrawYGridlinesOff()
            self.machine_actor.DrawZGridlinesOff()


    @Slot()
    def toggleProgramBounds(self):
        if len(self.path_actors) > 0:
            bounds = self.path_actors[1].GetXAxisVisibility()
            if bounds:
                self.path_actors[1].XAxisVisibilityOff()
                self.path_actors[1].YAxisVisibilityOff()
                self.path_actors[1].ZAxisVisibilityOff()
            else:
                self.path_actors[1].XAxisVisibilityOn()
                self.path_actors[1].YAxisVisibilityOn()
                self.path_actors[1].ZAxisVisibilityOn()
            self.update_render()