New Post: how to add new layout document from code

I am working in an PowerBuilder.net project (wpf project, but in the powerbuilder ide) and just now I have a issue with open a new layout document from my application menu. The question is how can i open dinamically 'n' new documents in my window using AvalonDock 2.0.

Note: I am working with fixed layouts documents and it is correct, but I need add new documents dinamically

How do it?

Sorry by my bad english