easyui datagrid 行编辑中combogrid和combobox显示问题

function showdataGrid() {

$('#data-list').datagrid({
title : '字段测试信息',
// url : "",
idField : 'sourceTableId',
pagination : false, // 分页
rownumbers : true, // 行号
singleSelect : false,// 单选
checkOnSelect : true,
autoRowHeight : false,// 是否设置基于该行内容的行高度
remoteSort : false,
striped : true,// 奇偶行显示不同背景色
fitColumns : true,// 自动扩大或缩小列的尺寸以适应网格的宽度并且防止水平滚动。
columns : [ [ {
field : 'sourceTableId',
checkbox : true
},{
field : 'sourceConnection',
hidden : true
},{
field : 'sourceTable',
hidden : true
},{
field : 'srcName',
title : '源链接',
width : 120,
sortable : true
},{
field : 'stnames',

title : '源表',
width : 160,
sortable : true
},{
field : 'sourceColumn',
title : '字段信息',
width : 190,
sortable : true,
editor:{
type:'combogrid',
options:{
 url : 'tbMdTable/searchColumnById.action',
 panelWidth:460, 
 multiple : true,
 editable: false,  
 idField: 'columnName', 
             textField: 'columnName',
   columns:[[
                       {field : 'tableId',hidden : true}, 
                       {field : 'columnId',checkbox : true}, 
                       {field : 'columnName',title : '列名',width : 150,sortable : false},
                       {field : 'columnType',title : '类型',width : 80,sortable : false}, 
                       {field : 'columnLength',title : '长度',width : 30,sortable : false}, 
                       {field : 'columnPrecision',title : '精度',width : 30,sortable : false}, 
                       {field : 'nullFlag',title : '为空',width : 30,sortable : false}, 
                       {field : 'autoincrementFlag',title : '自增',width : 30,sortable : false}, 
                       {field : 'primaryFlag',title : '主键',width : 30,sortable : false}, 
                       {field : 'foreignKeyFlag',title : '外键',width : 30,sortable : false}, 
                       {field : 'columnDefault',title : '默认值',width : 30,sortable : false},
                       {field : 'columnDesc',title : '描述',width : 60,sortable : false}