I'm new to web development and SilverStripe, and I learned a lot in the last weeks. I'm trying to write a module to manage registration requests. After starting with a RegistrationRequest-Object and and according Overview-Page with a has_one/has_many relation, I changed the Overview to a ModelAdmin, because of some ID issues. Now I'd like to extend the ModelAdmin page in the CMS to provide more functionality than just the delete button (i. e. buttons to accept/reject/inquire a request). Could anyone give me a hint on how to do that? Is there a way to add custom buttons to the tabular CMS page?