WPF MDI in Visual Studio 2012

I am developing a system in WPF with Ribbons and want to use MDI, but I am not able to use the dll's Codeplex and other research I did always lead me to the same place ...

Is there any alternative to MDI for Visual Studio 2012?

Thanks!

Solution

Avalondock is quite simple to use and we can restyle it as well

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