AjaxControlToolkit 與 addEventListener 沖突的問題

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hellow :

請教一下 ,我在工程中使用AjaxControlToolkit dll 和如下代碼做了一個進度條

<asp

anel ID="

anel1" runat="server" Style="display: none" CssClass="modalPopup">
                  <img src="../Images/loading.gif" alt="操作进行中，请稍等... ..." style="width: 50px; height: 50px;" />
                  操作进行中，请稍等... ...
            </asp

anel>
<cc1:ModalPopupExtender ID="ModalPopupExtender1" runat="server" TargetControlID="btnUpload"
PopupControlID="

anel1" BackgroundCssClass="modalBackground" BehaviorID="Behavior1">
            </cc1:ModalPopupExtender>
            <cc1:ModalPopupExtender ID="ModalPopupExtender2" runat="server" TargetControlID="btnImportData"
                  PopupControlID="

anel1" BackgroundCssClass="modalBackground" BehaviorID="Behavior2">
            </cc1:ModalPopupExtender>
后臺代碼
btnUpload.Attributes.Add("onclick", " var modalPopup = $find('Behavior1'); modalPopup.show(); Import(); " + ClientScript.GetPostBackEventReference(btnUpload, "") + "; return false;");
         btnImportData.Attributes.Add("onclick", " var modalPopup = $find('Behavior2'); modalPopup.show(); " + ClientScript.GetPostBackEventReference(btnImportData, "") + "; return false;");

為什么在進度條完成后監聽cellchange 不起作用,監聽代碼如下:
window.onload = function () {

         var spread1 = document.getElementById("fpsWebRfqDtl");
         if (document.all) {
            if (spread1.addEventListener) {

                  //IE9

                  spread1.addEventListener("ActiveCellChanged", cellChanged, false);

            }
            else {

                  //Other versions of IE and IE9 quirks mode (no doctype set)

                  spread1.onActiveCellChanged = cellChanged;

            }

         }
         else {

            // Firefox

            spread1.addEventListener("ActiveCellChanged", cellChanged, false);
         }
      }
因upload按鈕時會顯示一個進度給用戶在沒有點擊upload時監聽起作用,在upload后就不起作用了,不知道是什么原因