I use a free dockcontainer control in my projects.
http://www.codeproject.com/KB/toolbars/VS_IDE_Dock_Container.aspx
After a while I realized it has several bugs, so I should switch to a new one.
Would you be so kind to recommend me a dock container system (like VS 2010 UI)? Does anyone know a really good, stable free component or an opensource project?
(WinForms/VS2010/C#/.Net 4)
Even if the library is a little aged I was very happy with WeifenLuo DockPanel. It is well documented and really easy to use. Not so intrusive in your code – even if you have to derive from a class to became a dockable panel, you can stick your existing user controls upon a panel you will create. In plus it is reliable: I had a GUI with this in prod and I never had problem about docking even in a day by day usage.