Hi Jeff
Here is a
modified
version of the QuickStart sample
that ships with Essential Diagram that demonstrates what you are
seeking to do.
You need to set the Origin property of the View. Take a look at the SetViewOrigin() method, which is also called when the Diagram is resized.
This could be bundled into a method inside the View and called after the magnification changes and maybe it would be a good idea to include this as a feature of the library and I am following up with the Diagram team on this.
Regards
Arun