Thanks for sharing this component!
This is an extract from the tutorial (http://www.youdev.net/post/2008/09/25/AvalonDock-Tutorial.aspx):
"In tutorial 2 you will see how to create Documents at runtime, use DockingManager methods and properties as well as check the state of contents. In addition we'll add methods to persist layout configurations using DockingManager.Save/RestoreLayout()."
When this will be available?