WPF Docking library

I need to u开发者_StackOverflow中文版se an existing WPF docking library. There are several libraries: AvalonDock .NetBar SanDock ActiPro Infragistics

does anyone has any experiance with one of those libraries? Can you recommend one of them?

I've used Actipro and it is very good. It's also under active development and improvement

Sofa is built on top of AvalonDock and provides interesting features. It can be used with both MEF and Prism and IMHO (as I am a developer of the team) can help a lot for Composite Applications

According to this article, AvalonDock is being used in SharpDevelop 4, so the SharpDevelop guys obviously think it's good!