Vista - WindowsFormsHost

I'm having a real problem with WindowsFormsHost. I have aNorthwoods GoDiagram
GoView that I need to host. I created the UserControl, singed it, etc. After
"discovering" the change in syntax from the doc, I can now host it just fine,
but i can't find any way to change its size or to have it resize itself
automatically. I have set options in XAML and I have tried to add these
elements manually in codebehind. Additionally, depending on the size that I
set for it, it seems to overwrite every other graphics object in the window -
meaning that it renders outside of its Grid container.

What gives here? Can anyone help?
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Michael Covert
Covert Consulting LLC