CiviCRM Community Forums (archive)

I've been setting up a custom report template and have seen how to add custom fields using the following lines (in my case, using participant custom fields):
   protected $_customGroupExtends = array( 'Participant' );
   protected $_customGroupGroupBy = true;

Now, what this seems to do is bring in all searchable custom fields to all sections of the report (Display Columns, Group columns, filters).  How can I then reference a specific custom field in the rest of the php code, so I can do things like set a default value in the filter or maybe rename it's title, etc?

I tried using custom_<ID> (ex: 'custom_4'), but that didn't seem to work - I could not change the title of the field, for example.

If anyone has a block of code referencing custom fields (or even a full report example), I'd appreciate it.