Hi Diego, yup that is correct - select the surface and use "Show pts" to turn on its edit points.

One quick note about "Show pts" - it does not work on all solids, it only works on a solid if all the surfaces touch one another at a "natural edge" rather than a "trimmed edge".

There is some description and illustration of that here:
http://moi3d.com/wiki/FAQ#Q:_Why_does_show_points_work_for_some_objects_but_not_others.3F

But you can always use "Show pts" on an individual un-joined surface though.

- Michael