理解菜单和工具栏的主要用途和创建步骤。能根据具体问题合理使用菜单和工具栏。能具备编写简单事件问题处理方法的能力。-Understanding the main menu and toolbar usage and create steps. Specific issues according to the rational use of menus and toolbars. Can write simple event with the ability to approach the prob