Code example for component with custom UI?

The Quick Graph component has a custom UI:

Is there publicly available code of a component with a custom UI?

What do you need to know is here:

https://developer.rhino3d.com/api/grasshopper/html/8a7974ab-7b2b-4f48-84d0-6e81b184e6b0.htm

and to work with GDI+ which is the render engine:

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Thank you!