I spend quite a bit of time in their demo code. I think you'll get a good head start on finding what you need. Below are links that will bring you right to the demos. All you need to do to see the code is toggle the view by using the tabs at the top right of the example window.
When you toggle view to code, look over to the left hand side. The file explorer type window shows the files used for the example. Click on one to see the code for that file.
Okay, first, I'd go here and see the "First Look" at the new RadDock (remember to toggle views before moving on to the next example)
Then check out the persistence ability of RadDock using exportable xml here,
and the best part... the example is already using MVVM :)
I hope this gives you a running start =)