Visualising an ERD with WPF

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Does anyone know of a Web or WPF control for visualising a (kind of) Entity Relationship Diagram.

I have a number of objects of different types and I need to provide an interactive environment for navigating around the objects using the relationships between them.

Has anyone done anything similar?

EDIT: I should have explained that I'd like the control to auto-populate (or have programmatic control over its population) given a relational dataset and ideally for the diagram to readjust when one or another object is selected.

Perhaps something a bit like this example but more star shaped and free or at least cheaper!

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I think your best bet is to go from the http://www.codeproject.com/Articles/24681/WPF-Diagram-Designer-Part-4

It was created in 2008 but still rocks. It has the connector routing and the ability to add / remove shapes. You probably only need a subset of the functionality.