在菜单中添加图像菜单，实现其子菜单功能，点击显示，在客户区绘制一幅图片，删除，图片消失。对应的两个自己画的对号，错号两个图标，也能实现相应功能-Add Image menu in the menu, to achieve its sub-menu function, click on show in the client area to draw a picture, delete, images disappear. Painted by the two corresponding check