一次VB作业，要求如下：建立一个图表显示应用程序。（文件、图形、多重窗体、对话框设计、菜单和控件综合设计） 图表功能不使用控件完成-A VB operations, requirements are as follows: the establishment of a chart showing the application. (Documents, graphics, multiple forms, dialog boxes, design, menus and controls int