通过编写触发对象后产生的动作执行程序完成下列任务：

①表面图、网格图或等高线图的图形显示；

②命令按钮响应绘制各类图形；

③添加菜单项实现图形窗口颜色的更改。

-Trigger objects by writing the action resulting from the implementation of the program complete the following tasks:

① surface map, contour map grid map or graphic display

② Draw a command button to respond to all kinds of graphics

③ Add menu item to change the color of graphics window.