autocad2004外挂，多文档管理，借用CustomTabCtrl，其余代码全部自写。并克服了绝大部份bug.-autocad2004 plug, multi-document management, loan CustomTabCtrl, since all the rest of the code written. And overcome the vast majority of the bug.

***** DocBar - AutoCAD 基于图形化可停坞的文档选择工具 -***** DocBar- AutoCAD can be stopped based on the graphical selection tool dock document*****