Ext.Net 1.x_Ext.Net_执行后台程序提示等待信息,运行完毕消失

<ext:Button ID="btnQuery" runat="server" Text="查询" Icon="Find">
                                        <DirectEvents>
                                            <Click OnEvent="Query"  Before="Ext.Msg.wait('正在提交数据，请稍候...','查询');" 
                                            Failure="Ext.Msg.show({
                                                    title:'Error',
                                                    msg:'查询失败',
                                                    minWidth:200,
                                                    modal:true,
                                                    icon:Ext.Msg.ERROR,
                                                    buttons:Ext.Msg.OK
                                                 });">
                                            </Click>
                                        </DirectEvents>
                                    </ext:Button>

this.btnTest.DirectEvents.Click.Before = "Ext.Msg.wait('上传...','上传');";