在水晶报表中实现任意选择指定字段显示资料

http://chaoyang1983.yculblog.com/post.975090.html
http://blog.csdn.net/haibodotnet/archive/2003/11/16/21524.aspx
http://blog.csdn.net/itmingong/archive/2005/04/26/363622.aspx