flex 在viewstack里使用AdvancedDataGrid，出现错误解决办法

默认情况下 只创建第一个,需要ViewStack的
creationPolicy="all",让ViewStack建立的时候把所有子对象都实例化

<?xml version="1.0" encoding="utf-8"?>
<!--SAX 2013-4-23? 房地产转让-->
<mx:TitleWindow xmlns:mx="http://www.adobe.com/2006/mxml"
????fontSize="12"
????paddingRight="10"
????paddingTop="10"
????paddingLeft="10"
????paddingBottom="10"
????xmlns:vo="VO.*"
????close="PopUpManager.removePopUp(this)" showCloseButton="true" 
????xmlns:ns1="Tools.*"
????creationComplete="initApp()" xmlns:ns3="com.steelpotato.footerDataGrid.*"
????xmlns:checkBoxColumn="SeControl.checkBoxColumn.*" xmlns:ns2="com.*" >
?<mx:Script>
??<![CDATA[
???import com.hitb.component.FangwuSetup;
???import com.hitb.component.move1;
???import com.hitb.component.move1;
???import com.hitb.util.GlobalManager;
???import flash.errors.*;
???import flash.events.*;
???import flash.external.*;
???import flash.net.URLRequest;
???import flash.net.URLVariables;
???import mx.collections.ArrayCollection;
???import mx.controls.Alert;
???import mx.controls.DateField;
???import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn;
???import mx.events.CloseEvent;
???import mx.events.DataGridEvent;
???import mx.events.DataGridEventReason;
???import mx.events.ScrollEvent;
???import mx.events.ValidationResultEvent;
???import mx.managers.PopUpManager;
???import mx.messaging.AbstractConsumer;
???import mx.rpc.events.ResultEvent;
???import mx.utils.StringUtil;
???import mx.validators.ValidationResult;
???import ROMAP.*;
???import Tools.Helper;
???import VO.LouVO;
???[Bindable]
???public var collection:ArrayCollection=new ArrayCollection();
???[Bindable]
???public var collectionLou:ArrayCollection=new ArrayCollection();
???[Bindable]
???public var lou:LouVO=new LouVO();
???public var tw:FangwuSetup = new FangwuSetup();
???private var panel:move1;
???public function initLou():void{
????c.removeAllChildren();
????panel=new move1();
????panel.percentWidth=100;
????panel.percentHeight=100;
????//测试代码，监听删除事件
????c.addChild(panel); 
???}
???//根据楼号模糊查询楼
???private function QueryLou():void{
????new LouRO(initAppOK).GetLouNameBywhere(ModelLocator.getInstance().userInfo.Nsrsbh,ModelLocator.getInstance().xmdjInfo.XM_ID.toString(),txtLou.text);
???}
???private function UpdateXML():void
???{
????lou=this.list.selectedItem as LouVO;
????new LouRO(UpdateXMLOK).GetLouByLouName1(ModelLocator.getInstance().userInfo.Nsrsbh,lou.louName);
????new DJfwzrRO(getFwOK).GetAll(ModelLocator.getInstance().userInfo.Nsrsbh,'');
???}
???private?function UpdateXMLOK(event:ResultEvent):void
???{
????ModelLocator.getInstance().salexml=event.result as String;
????ModelLocator.getInstance().isSale='1'
????initLou();
???}
???/**
??? * 作者：IT小金
??? * 时间：2011-09-07
??? * 功能:FLex DataGird生成HTML 导出Excel
??? */
???/*将DataGird导出成HTML格式*/
???private function convertDGToHTMLTable(dg:AdvancedDataGrid):String {
????//设置默认参数
????var font:String = dg.getStyle('fontFamily');
????var size:String = dg.getStyle('fontSize');
????var str:String = '';
????var colors:String = '';
????var style:String = 'style="font-family:'+font+';font-size:'+size+'pt;"';??????????????? 
????var hcolor:Array;
????//设置标题行颜色
????if(dg.getStyle("headerColor") != undefined) {
?????hcolor = [dg.getStyle("headerColor")];
????} else {
?????hcolor = dg.getStyle("headerColors");
????}?????????????? 
????//根据datagrid设置基础结构
????str+= '<table width="'+dg.width+'" border="1"><thead><tr width="'+dg.width+'" style="background-color:#' +Number((hcolor[0])).toString(16)+'">';
????//设置列头????????? 
????for(var i:int = 0;i<dg.columns.length;i++) {
?????colors = dg.getStyle("themeColor");
?????if(dg.columns[i].headerText != undefined) {
??????str+="<th "+style+">"+dg.columns[i].headerText+"</th>";
?????} else {
??????str+= "<th "+style+">"+dg.columns[i].dataField+"</th>";
?????}
????}
????str += "</tr></thead><tbody>";
????colors = dg.getStyle("alternatingRowColors");

????//设置单元格数据，数据遍历DataGird
????for(var j:int =0;j<dg.dataProvider.length;j++) {???????????????? 
?????str+="<tr width=""+Math.ceil(dg.width)+"">";
?????for(var k:int=0; k < dg.columns.length; k++) {
??????if(dg.dataProvider.getItemAt(j) != undefined && dg.dataProvider.getItemAt(j) != null) {
???????if(dg.columns[k].labelFunction != undefined) {
????????str += "<td width=""+Math.ceil(dg.columns[k].width)+"" "+style+">"+dg.columns[k].labelFunction(dg.dataProvider.getItemAt(j),dg.columns[k].dataField)+"</td>";
???????} else {
????????str += "<td width=""+Math.ceil(dg.columns[k].width)+"" "+style+">"+dg.dataProvider.getItemAt(j)[dg.columns[k].dataField]+"</td>";
???????}
??????}
?????}
?????str += "</tr>";
????}
????str+="</tbody></table>";
????return str;
???}
//合计函数
???private function flatSummaryObject():Object
???{
????return {Xsmj:"合计:",summary:true };
???}
???private?function getFwOK(event:ResultEvent):void
???{
????collection=event.result as ArrayCollection;???
????gc.refresh();
???}
???private?function getFwOK1(event:ResultEvent):void
???{
????collection=event.result as ArrayCollection;
????
????gc.refresh();
????this.vs.selectedIndex=1;
???}
???//初始化函数，查询全部的楼
???private function initApp():void{
????new LouRO(initAppOK).GetLouNameBywhere(ModelLocator.getInstance().userInfo.Nsrsbh,'');
????new DJfwzrRO(getFwOK).GetAll(ModelLocator.getInstance().userInfo.Nsrsbh,'');
???}
???//回调函数，赋值
???private?function initAppOK(event:ResultEvent):void
???{
????collectionLou=event.result as ArrayCollection;
???}
???/*接Asp。net中 ashx一般处理程序，输出html成Excel文件
??? */
???private function loadDGInExcel(dg:AdvancedDataGrid,url:String):void {
????var variables:URLVariables = new URLVariables(); 
????variables.htmltable = convertDGToHTMLTable(dg);
????var u:URLRequest = new URLRequest(url);
????u.data = variables; 
????u.method = URLRequestMethod.POST; 
????navigateToURL(u,"_self");
???}
???//设置样式
???private function myStyle(data:Object,column:AdvancedDataGridColumn):Object
???{
????var output:Object;
????if(data.Xsmj==null){
?????output={color:"#095464",fontWeight:"bold"};
????}
????return output; 
???}
???//查看销售记录按钮
???private function onCheckClick():void{

????new DJfwzrRO(getFwOK1).GetAll(ModelLocator.getInstance().userInfo.Nsrsbh,'');
???}
???//导出销售记录
???private function onDaochuClick():void{
????var url:String='../JinExcelExport.ashx';
????//var url:String='http://localhost:2208/WebSite/JinExcelExport.ashx';
????loadDGInExcel(this.dg,url);
???}
???//销售记录列表中的返回按钮
???private function onReturnClick():void{
????this.vs.selectedIndex=0;
???}
???
??]]>
?</mx:Script>
?<mx:HBox width="100%" height="100%">
??<mx:Canvas width="10%" height="100%" borderStyle="solid">
???<mx:Label x="2" y="6" text="楼号：" />
???<mx:TextInput x="37" y="5" width="74" id="txtLou"? change="QueryLou()"/>
???<mx:List id="list" x="0" y="34"? width="98%" dataProvider="{collectionLou}"? textAlign="center" itemClick="UpdateXML()" rowHeight="100" labelField="louName" borderStyle="none" height="100%" >
????<mx:itemRenderer>
?????<mx:Component>
??????<mx:VBox?? verticalAlign="middle" horizontalAlign="center">????????????? 
???????<mx:Image? right="10" source="assets/hotel.png"? height="64" width="64"/>
???????<mx:Label right="10"? text="{data.louName}" />???? 
??????</mx:VBox> 
?????</mx:Component>
????</mx:itemRenderer>
???</mx:List>
??</mx:Canvas>
??<mx:ViewStack? width="90%" height="100%" id="vs" creationPolicy="all">
???<mx:VBox borderStyle="solid" height="100%" width="100%">
????<mx:Button? label="查看销售记录" left="0" click="onCheckClick()"/>
????<mx:Panel?? width="100%" height="95%"? layout="horizontal"??? title="{'当前选中的是：'+lou.louName==null?'':lou.louName}"
??????? paddingLeft="15"
??????? headerHeight="20"?? 
??????? headerColors="{['#fff000','#fff000']}" 
??????? borderStyle="solid"? borderColor="#9cc0e1"
??????? backgroundColor="#e8eaea"
??????? dropShadowEnabled="false"????? borderThickness="0" id="c" verticalAlign="middle" horizontalAlign="center" />
????<mx:Canvas width="100%" height="5%">
?????<mx:Label x="5" y="0" text="颜色标识："/>
?????<mx:TextInput x="65" y="0" color="#eee969"? enabled="true" width="30" borderStyle="none" backgroundColor="#EEE969" editable="false" borderColor="#EEE969" themeColor="#EEE969"/>
?????<mx:Label x="93" y="0" text="未售"/>
?????<mx:TextInput x="130" y="0" color="#ED0F33" enabled="true" editable="false" width="32" borderStyle="none" backgroundColor="#ED0F33" borderColor="#ED0F33" themeColor="#ED0F33"/>
?????<mx:Label x="161" y="0" text="已售"/>
?????<mx:Label x="205" y="0" text="双击进行楼房销售"/>
????</mx:Canvas>
???</mx:VBox>
???<mx:VBox borderStyle="solid" height="100%" width="100%">
????<mx:Canvas width="100%"? height="5%">
?????<mx:Button x="90" y="0" label="返回" click="onReturnClick()"/>
?????<mx:Button x="164" y="0" label="导出" click="onDaochuClick()"/>
????</mx:Canvas>
????<mx:AdvancedDataGrid? width="100%" defaultLeafIcon="{null}" displayItemsExpanded="true" styleFunction="myStyle" height="95%"? borderColor="#0A9AFF" id="dg" borderStyle="solid"? >
?????<mx:dataProvider>
??????<mx:GroupingCollection id="gc" source="{collection}"> 
???????<mx:Grouping >
????????<mx:GroupingField name="Xshth"? >
?????????<mx:SummaryRow summaryPlacement="group">
??????????<mx:SummaryField operation="SUM" dataField="Htje" label="小计"/>
?????????</mx:SummaryRow>
????????</mx:GroupingField>??
???????</mx:Grouping>
???????<!--最后一行加上总计-->
???????<mx:summaries>
????????<mx:SummaryRow summaryPlacement="last" summaryObjectFunction="flatSummaryObject">
?????????<mx:SummaryField? operation="SUM"? dataField="Htje" label="小计" />?
????????</mx:SummaryRow>?????????
???????</mx:summaries>?
??????</mx:GroupingCollection>
?????</mx:dataProvider>
?????<mx:columns>
??????<mx:AdvancedDataGridColumn headerText='楼号' dataField='Lh' />
??????<mx:AdvancedDataGridColumn headerText='单元' dataField='Dy' />
??????<mx:AdvancedDataGridColumn headerText='房号' dataField='Fh' />
??????<mx:AdvancedDataGridColumn headerText='面积M2' dataField='Xsmj' id="XsmjColumn" />
??????<mx:AdvancedDataGridColumn headerText='价款' dataField='Htje' id="HtjeColumn"/>
??????<mx:AdvancedDataGridColumn headerText='合同编号' dataField='Xshth'/>
??????<mx:AdvancedDataGridColumn headerText='发票号' dataField='Fph'/>
??????<mx:AdvancedDataGridColumn? dataField='小计'/>
?????</mx:columns>
????</mx:AdvancedDataGrid>
???</mx:VBox>
??</mx:ViewStack>
?</mx:HBox>
</mx:TitleWindow>