Making a button

I am trying to make a button using a model entity. I can't figure out how to do this.

If I use a prop, under the entity list I don't get the func_button option (same for a door no func_door option)

Only thing I can think of using is the prop_static/dynamic.. though that does not seem to work. I can't find any tutorials on this. Anyone able to post a link or help would be great thanks !

just place a brush around the prop with the no-draw texture and make
that a func_button, although I believe the outputs prevents us from
having to make a func_button altogether