获得easyUi dialog 对话框title的属性值

<div id="dlg" class="easyui-dialog" title="Toolbar and Buttons" style="1040px;height:600px;padding:10px" 
            data-options="
                
                buttons: [{
                    text:'保存',
                    iconCls:'icon-ok',
                    handler:function(){
                        ChangeMessage();
                    }
                },{
                    text:'关闭',
                    handler:function(){
                        alert('cancel');;
                    }
                }]
            ">


        <table id="detail_table" iconCls="icon-save" title="My Window" style=" 100%; height: 300; font-size: 14px;" class="table">
    <tr>
        <td align="right">编号</td>
        <td align="left"><input id="MessageId" class="combo datebox" style="180px; height: 20px;" readonly="true"></td>
        <td align="right">菜单名称</td>
        <td align="left"><input id="MessageTitle" class="combo datebox" style="180px; height: 20px;"></td>
        <td align="right">数据类型</td>
        <td align="left">
            <select id="MessageType" class="easyui-combobox" panelHeight="auto" style="180px" onchange="MessageType_change(this)">
                <option value="MODE">模块</option>
                <option value="MENU">菜单</option>
                <option value="TEXT">文本</option>
            </select>
        </td>
    </tr>
    <tr>
        <td align="right">上级编号</td>
        <td align="left"><input id="ParentID" class="combo datebox" style="180px; height: 20px;" readonly="true"></td>
        <td align="right">创建人</td>
        <td align="left"><input id="MessageAuthorId" class="combo datebox" style="180px; height: 20px;" value="admin" readonly="true"></td>
        <td align="right">创建时间</td>
        <td align="left"><input id="MessageDate" class="combo datebox" style="180px; height: 20px;" readonly="true"></td>
    </tr>


    <tr id="Content_textarea">
        <td colspan="6">
            内容&emsp;
            <textarea class="ckeditor" cols="80" id="MessageContent_ckeditor" name="editor1" rows="10"></textarea>
           
        </td>
    </tr>
@*    <tr id="Content_input">
        <td>
            内容
        </td>
        <td><input id="MessageContent" class="combo datebox" style="180px; height: 20px;"></td>
        <td colspan="4"></td>
    </tr>*@
    <tr>
        <td colspan="6">&emsp;</td>
    </tr>
</table>
    </div>

//调用 
   alert($('#dlg').panel('options').title);