extjs 表格下拉框

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ExtJs在表格可编辑的单元格中嵌入下拉框：
{dataIndex:'textInnerV',width:110,align:'center',
     editor:new Ext.grid.GridEditor(
         new Ext.form.ComboBox({
             mode :'local',
             editable:false,                             
             displayField:'text',
             valueField:'val',
             hiddenName:'glassHiddenValue',
             hiddenValue:'val',
             triggerAction: 'all',
             store: new Ext.data.ArrayStore({
                 fields: ['text', 'val'],
                 data : glassTypeStr
             })
       })
)},

  { header: '单位名称', dataIndex: 'unitname',
                    field:
                 { xtype: 'combo',
                     editable: false,
                     emptyText: "请选择...",
                     valueField: "id",
                     displayField: "text",
                     mode: 'local',
                     store: storeddl
                 }
                }
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