编写一个单文档应用程序，添加【图像显示】菜单，点击以后在视图区能显示一幅8位灰度图，并在【查看】菜单里添加【显示直方图】一项子菜单，消息相应后弹出对话框显示右边灰度图相应的直方图。-Write a single document application, add [Image Display] menu, click on later in the view area to show an 8 grayscale, and in the [View] menu to display the hi