一个MDI程序里如果有两种以上类型的文档，新建时就会出现一个CNewTypeDlg，非常的难看，本程序给出了一种新颖的方法，类似于protel里面的新建对话框，美观大方-an MDI program, like if two or more types of documents, there will be new when a CNewTypeDlg, very embarrassing. this program is a novel approach, similar to the Pro