DatePicker.ClientID获取不到子窗口传回的值

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DatePicker.ClientID获取不到子窗口传回的值.如何处理?

甘桂

弹出窗口内容：
string Sdatetime = GetSelectedDataKeyDateTime(Grid1, 6).ToString();//tabel valuse is datetime
        PageContext.RegisterStartupScript(ActiveWindow.GetWriteBackValueReference(contractinfoID, contractID, username, usernameTel, lineID, teamtype, Sdatetime, days, APS, BPS)
            + ActiveWindow.GetHideReference());

接收页面内容：

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string selectRoleURL = String.Format("../BusinessManage/Contract_RelevanceID.aspx", HidtbRelevanceID.GetValueReference());
        VIPrelevanceID.OnClientTriggerClick = Window1.GetSaveStateReference(HidtbRelevanceID.ClientID, VIPrelevanceID.ClientID, VIPname.ClientID, VIPtel.ClientID, lineName.ClientID, teamtype.ClientID, Sdatetime.ClientID, days.ClientID, NumAPS.ClientID, NumBPS.ClientID)
                + Window1.GetShowReference(selectRoleURL, "选择合同内容");
其中Sdatetime.ClientID是
DatePicker控件，为什么接收不到数据？其他的控件都正常。调试时也数据。