What is the correct way to obtain the roweditor plugin from within a gridpanel when using Ext Designer generated code? I'm struggling with this and have tried all sorts of options.....

The code generated by designer 1.2.2 is:-
Code:
/*
 * File: app/view/ui/MyGridPanel.js
 * Date: Fri Oct 21 2011 10:31:04 GMT+0100 (GMT Daylight Time)
 *
 * This file was generated by Ext Designer version 1.2.2.
 * http://www.sencha.com/products/designer/
 *
 * This file will be auto-generated each and everytime you export.
 *
 * Do NOT hand edit this file.
 */

Ext.define('MyApp.view.ui.MyGridPanel', {
    extend: 'Ext.grid.Panel',

    height: 250,
    width: 400,
    title: 'My Grid Panel',
    store: 'MyJsonStore',

    initComponent: function() {
        var me = this;

        Ext.applyIf(me, {
            columns: [
                {
                    xtype: 'gridcolumn',
                    dataIndex: 'id',
                    text: 'Id'
                },
                {
                    xtype: 'gridcolumn',
                    dataIndex: 'name',
                    editor: 'textfield',
                    text: 'Name'
                }
            ],
            viewConfig: {

            },
            dockedItems: [
                {
                    xtype: 'toolbar',
                    dock: 'top',
                    items: [
                        {
                            xtype: 'button',
                            text: 'Add'
                        },
                        {
                            xtype: 'button',
                            text: 'Delete'
                        }
                    ]
                }
            ],
            plugins: [
                Ext.create('Ext.grid.plugin.RowEditing', {

                })
            ]
        });

        me.callParent(arguments);
    }
});
and the file to edit is :-

Code:
/*
 * File: app/view/MyGridPanel.js
 * Date: Wed Oct 19 2011 10:37:01 GMT+0100 (GMT Daylight Time)
 *
 * This file was generated by Ext Designer version 1.2.0.
 * http://www.sencha.com/products/designer/
 *
 * This file will be generated the first time you export.
 *
 * You should implement event handling and custom methods in this
 * class.
 */

Ext.define('MyApp.view.MyGridPanel', {
  extend: 'MyApp.view.ui.MyGridPanel',

  initComponent: function() {
    var me = this;
    me.callParent(arguments);
    me.down('button[text=Add]').on('click', me.onAddClick, me);
   
  
  },
  onAddClick: function() {
    var me = this;
    var roweditor=me.down( 'what do I put here? ');

  // Do something with it...
  }
});
So in my onAddClick I want to obtain the editor and do something with it, any ideas, help appreciated....