modx.Resource кастомизация ресурса

Plugin
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<?php
if($modx->event->name != 'OnDocFormRender' || $resource->get('template')!= 1) return '';

$modx->controller->addLastJavascript('/assets/components/myfields/js/mgr/resource/field.js');

js
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Ext.override(MODx.panel.Resource, {
    getParentMainRightFields: MODx.panel.Resource.prototype.getMainRightFields,

    getMainRightFields: function (config) {
        var parentMainRightFields = this.getParentMainRightFields.call(this, config);

        parentMainRightFields.push({
            xtype: 'modx-combo-user-new'
            ,fieldLabel: _('user')
            ,name: 'user'
            ,id: 'modx-resource-createdby'
            ,maxLength: 255
            ,anchor: '100%'
            ,value: config.record.createdby || ''
            ,renderer: true
        });

        return parentMainRightFields;
    }
});


MODx.combo.UserNew = function(config) {
    config = config || {};
    Ext.applyIf(config,{
        hiddenName: 'createdby'
        ,displayField: 'username'
        ,valueField: 'id'
        ,fields: ['username','id']
        ,pageSize: 20
        ,url: MODx.config.connector_url
        ,baseParams: {
            action: 'security/user/getlist'
        }
        ,typeAhead: true
        ,editable: true
    });
    MODx.combo.User.superclass.constructor.call(this,config);
};
Ext.extend(MODx.combo.UserNew,MODx.combo.ComboBox);
Ext.reg('modx-combo-user-new',MODx.combo.UserNew);