I have a problem with grocery CRUD and "set_relation_n_n" function: http://www.grocerycrud.com/documentation/options_functions/set_relation_n_n
I want the fields from "This Table", "Relation Table" and "Selection Table". There are any way to do that?. This is my schema (MySQL):

EDITED:
A few things (by the moment):
This table: timeline_events;
Relation table: timeline_events_options;
Selection table: timeline_events_tags;
id_timeline is the foreign key from another table (not showing in the image above), event_id is a field required for the widget I am using now. id_event is the foreign key from timeline_events, id_event_tags is the foreign key from timeline_events_tags.
Thank you very much for your answers :).