admin-interface

I'm managing my admin backend with Typus I want to add a field with a checkbox for each category. I used this code: Post: fields: default: name, description, user, categories list: name, description, user, categories form: name, description, user, categories relationships: categories But the result is a textfield with a [] inside: how do I solve this? Is there a native way or must I override the field template? To show the the checkbox for the fields you can use the existing template of the Typus Post: fields: default: name, description, user, categories list: name, description, user,