Hello
Lukas,
You can also check the RadDiagram control, which is currently in Beta:
http://demos.telerik.com/aspnet-ajax/diagram/examples/overview/defaultcs.aspx. It should allow you to create the shapes and connections from the configuration that is shown in the attached screenshot.
If you choose the diagram control for your implementation, I would also suggest checking the following demo, because it will help you set the right layout for the diagram (the one in the screenshot uses Tree Up layout):
http://demos.telerik.com/aspnet-ajax/diagram/examples/layouts/defaultcs.aspx
Regards,
Slav
Telerik
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