Amending ModxCampaignMonitor extra to allow MCM.combo.resource to only show resources that are direct children on a parent resource

getchildlist.class.php

<?php
/** core/components/mcm/processors/mgr/resource/getchildlist.class.php */
/**
 * Create this file to allow filtering of resources by a parent ID
 *
 * @param int $parentId
 * @return array Array of modResource child elements
 * 
 */
if(!class_exists('modObjectGetListProcessor')){
  include MODX_CORE_PATH.'model/modx/processors/resource/getlist.class.php';
}
class MCMResourceGetChildListProcessor extends modObjectGetListProcessor {
  
    /**
     * Amend the xPDO query to allow specifying a 'parent' attribute
     */
    public function prepareQueryBeforeCount(xPDOQuery $c) {
        $parent = (int)$this->getProperty('parent',false);
        if($parent !== false){
            $c->where(array('parent') => $parent));
        }
        return $c;
    }
};
return 'MCMResourceGetChildListProcessor';

mcm.combo.resource.js

/** assets/components/mcm/mgr/js/mcm.combo.resource.js **/
MCM.combo.Resource = function(config){
    config = config || {};
    Ext.applyIf(config,{
     id: 'mcm-combo-resource' 
    ,name: 'resourceID'
    ,hiddenName: 'resourceID'
    ,displayField: 'pagetitle'
    ,valueField: 'id'
    ,mode: 'remote'
    ,fields: ['id','pagetitle']
    ,forceSelection: true
    ,editable: false
    ,enableKeyEvents: true
    ,pageSize: 20
    ,url: MCM_CONNECTORS+'connector.php'  /** CHANGE THIS LINE TO POINT TO DIFFERENT CONNECTOR**/
    ,baseParams: { 
	   action: 'getChildList'    /** CHANGE THIS LINE TO USE THE NEW PROCESSOR CREATED ABOVE **/
	  ,showNone: true
        }         
    });
    MCM.combo.Resource.superclass.constructor.call(this, config);
};
Ext.extend(MCM.combo.Resource,MODx.combo.ComboBox);
Ext.reg('mcm-combo-resource',MCM.combo.Resource);