Vista - Custom designer?

Hi!

It seems like it is not crowded here, is it? :-)

I need to write some application, which can change its own forms on the fly ( like MS Access ? ).
So Iooked for ability to switch into the designer mode and back inside one application.

For Windows Forms I found the good example, DesignerHost.
"INFO: Code Sample That Demonstrates How to Create a Custom Form Designer by Using Visual C# .NET" ( KB813808 )
Looks great. It even can save all that staff in form of XML ( but not XAML ).

Now I want to do it with WPF ( Avalon? ).
Because the XAML looks like the most natural format for this task.
So, where is the sample? I did not find it yet.

How can I host the designer mode for WPF?

Aleksey.