开发autocad插件，实现在工具栏里添加按钮，当用户单击按钮时弹出UI供用户设置密级；在autocad文档原有内容上添加水印功能，防止泄密-Autocad plugin development to achieve the Add button in the tool bar when the user clicks the button, pop-up UI for the user to set the security classification autocad document i