Add custom button in Detail View to call controller action

I don’t know of any document explaining specifically that, although there are many explaining small different customizations which, put together, might do what you need.

But something that worked in SugarCRM 6.5 should work in SuiteCRM. Maybe you can share with us the details of what your’re trying, post your code and which files you’re changing, and we can try and have a look?