Answered Manually adding a row to an ExtJS filter combo?

class GroupFilterGetListProcessor extends modObjectGetListProcessor {
    public $classKey = 'GoodNewsGroup';
    public $languageTopics = array('goodnews:default');
    public $defaultSortField = 'name';
    public $defaultSortDirection = 'ASC';
    public $objectType = 'goodnews.group';

    public function prepareQueryBeforeCount(xPDOQuery $c) {
        $c->select(array(
            'GoodNewsGroup.id',
            'GoodNewsGroup.name',
        ));
        return $c;
    }

    public function prepareRow(xPDOObject $object) {
        $resourceArray =  $object->toArray('', false, true, true);
        return $resourceArray;
    }

    public function beforeIteration(array $list) {
        // additional option value "no group assigned"
        if ($this->getProperty('addNoGroupOption', false)) {
            $list[] = array(
                'id' => '0',
                'name' => $this->modx->lexicon('goodnews.subscribers_no_group'),
            );
        }
        return $list;
    }

}
return 'GroupFilterGetListProcessor';

        {
            xtype: 'modx-combo'
            ,id: 'goodnews-categories-group-filter'
            ,emptyText: _('goodnews.subscribers_user_group')+'...'
            ,width: 200
            ,listWidth: 250
            ,displayField: 'name'
            ,valueField: 'id'
            ,store: new Ext.data.JsonStore({
                url: GoodNews.config.connectorUrl
                ,baseParams: {
                    action : 'mgr/groups/getGroupFilterList'
                    ,addNoGroupOption: true
                }
                ,fields: ['id','name']
                ,root: 'results'
            })
            ,listeners: {
                'select': {fn:this.filterByUserGroup,scope:this}
            }
        }