>Has anybody tried it? And if it's not advisable, what's the alternative organization for a transaction based (desktop) application that requires a large amount of different forms? Tabcontrol will only allow a limited amount of different forms, and the forms cannot be viewed simultaneously.
>
>And if I do insist on mdi, I'd better go WinForm than WPF?

I use MDI with WinForm when needed. I try to limit its use to cases where the user thinks that it will be helpful.
However, implementing it is disarmingly simple