Editing Grasshopper UI Through Addon

I’m wondering if anyone has made, or seen an add-on that changes the grasshopper UI?
For example, I’m wondering if it’s possible to add buttons to the grasshopper tool bar:

I haven’t been able to come across any examples where this has been done.

Some of the attempts

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also this thread from few minutes ago.

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This is perfect, thanks for pointing me in the right direction!

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