在WPF中根本不支持MDI.

There''s no support for MDI in WPF - at all.

此处是开放的WPF/MDI在Codeplex上的源实现:

http://wpfmdi.codeplex.com/ [ ^ ]

Here''s an open source implementation of WPF/MDI on Codeplex:

http://wpfmdi.codeplex.com/[^]