Extjs 简单问题求助,grid的列中如何放combox下拉列表

[tongkuang]

想在一个grid里其中一列放置一个下拉列表，代码如下，不知哪里有问题，各位帮忙看一下，谢谢！

var fieldSet = new Ext.ux.FieldSet({
defaults: { width : 330 },
autoHeight:true
});

var mystore = new Ext.data.Store({
fields: [
{name: 'common', type: 'string'},
{name: 'botanical', type: 'string'}
]
}),

var objSex = new Ext.form.ComboBox({
hideLabel: true,
lazyRender: true,
store: strSex,
displayField: "name",
valueField: "value",
mode: "local",
editable: false,
triggerAction: "all"
});

var gridColumns = new Ext.grid.ColumnModel([//列模式
{ header: "ID", dataIndex: "id", visiable: true,hidden: true },
{ header: "姓名", dataIndex: "name", visiable: true },
{ header: "性别", dataIndex: "sex", visiable: true,editor: objSex }
]);

var grid = new Ext.grid.EditorGridPanel ({//数据显示面板
border: false,
loadMask: true,
clicksToEdit:2,
width: 500,
height: 300,
store: mystore,
cm: gridColumns,
clicksToEdit: 2,
region:'center'//border布局必须
});

fieldSet.add(grid);
return fieldSet;