DataGrid翻页时保存当前CheckBox选中状态

提示：显现思路是在点击下一页是将选中状态和id，合同金额等数据保存在集合中，同时在刷新时将集合的数据遍历，如果选中状态为true则表示为选中状态。 
private var availableArray:ArrayCollection = new ArrayCollection();//保存项目id和available状态
    private var dataArray:ArrayCollection = new ArrayCollection();//保存id
    private var nextOrPreviousPage:Boolean = false;//是否为翻页操作
    public function refreshQueryHandler(e:Event):void{
    nextOrPreviousPage = true;
    var object:Object;
    for(var i:int = 0; i < ArrayCollection(execData.dataProvider).length; i++)
    {
    if(availableArray.length != 0 && dataArray.length != 0
        && dataArray.getItemIndex(ArrayCollection(execData.dataProvider)[i].id) != -1)
    {
    availableArray.removeItemAt(dataArray.getItemIndex(ArrayCollection(execData.dataProvider)[i].id));
                    dataArray.removeItemAt(dataArray.getItemIndex(ArrayCollection(execData.dataProvider)[i].id));
                }  
    //状态为选中，并且集合中没有改数据
    if(ArrayCollection(execData.dataProvider)[i].available && !dataArray.contains(ArrayCollection(execData.dataProvider)[i].id))
    {
        object = new Object();
                    object.data = ArrayCollection(execData.dataProvider)[i].id;  
                    object.label = ArrayCollection(execData.dataProvider)[i].available;
                    object.contractMoney = ArrayCollection(execData.dataProvider)[i].contractTotalMoney;
                    dataArray.addItem(ArrayCollection(execData.dataProvider)[i].id);  
                    availableArray.addItem(object);
    }
    }
                queryControl(mypaging.pBean,viewStack.selectedIndex + 1);
           }

private function queryControlResult(event:ResultEvent):void{
var pb:PageBean = event.result as PageBean;
controlArr=pb.list;
execData.dataProvider=controlArr;
dutyPersonData.dataProvider=controlArr;
timeData.dataProvider=controlArr;
longData.dataProvider=controlArr;
projectChangeDG.dataProvider = controlArr;
mypaging.init(pb);
if(nextOrPreviousPage && availableArray.length != 0)
{
                    for(var m:int = 0; m < availableArray.length; m++)
                    {
                        for(var n:int = 0; n < ArrayCollection(execData.dataProvider).length; n++)
                        {
                             if(availableArray[m].data == ArrayCollection(execData.dataProvider)[n].id)
                             {
                                ArrayCollection(execData.dataProvider)[n].available = availableArray[m].label;
                             }
                        }  
                    }
                    execData.invalidateList();
}
}