Fit Contributer App Examples

Hey guys, 

Does anyone know of any code examples I can look at , of how to modify an APP that is already setup to record a session, to add extra fit fields into the recording? 

I tried this from the RecordSample , but I'm getting symbol createField unknown for some reason, I am missing something here.

... I think it's a scope issue, but I don't know how to remedy it

using Toybox.WatchUi;
using Toybox.ActivityRecording;
using Toybox.Timer;
using Toybox.System;
using Toybox.FitContributor;

var session = null;
    var WindAxisField = null;
    var WindSpeedField = null;

	const WINDAXIS_FIELD_ID = 0;
	const WINDSPEED_FIELD_ID = 1; 
	

	
class SailRacerDelegate extends WatchUi.BehaviorDelegate {
		
    function initialize() {
        BehaviorDelegate.initialize();
       
        WindAxisField = createField( " Wind Axis " , WINDAXIS_FIELD_ID, FitContributor.DATA_TYPE_FLOAT, {:mesgType=> FitContributor.MESG_TYPE_SESSION, :units=>" Degrees "});
		WindAxisField.setData($.gwindaxis);
	System.println("wwwiiiiiiiinnnnnnnnndddddddddaaaaaaaaaxxxxxxxxxiiiiiiiiissssssssrecorded");
		WindSpeedField = Field.createField(
            " Wind Speed ",
            WINDSPEED_FIELD_ID,
            FitContributor.DATA_TYPE_FLOAT, {:mesgType=>FitContributor.MESG_TYPE_SESSION, :units=>" Kts "});
			WindSpeedField.setData($.gwindspeed);    
    
        
    }