Adding Buttons to the Entity Detail in CP

I would like to add a button that executes a custom action somewhere on the details page of an Entity. For example, next to the "Visit URL" button:


After a quick search across the docs, I could not find a way to do this. Is there some hidden, undocmented way? Could I achieve something similar using custom fieldtypes?

Answered by Jack McDade!
>>>>>>> Answered <<<<<<<
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