Telerik-RadWindow,RadAjaxManager and IE9 crash application

I am using Telerik control,There two page List and Detail page. Detail page opens Radwindow. After closing radwindow, ajaxrequest is refreshing grid of list page(parent page).

<telerik:RadWindowManager ID="RadWindowManager1" Height="665px" Width="1200px" runat="server"
            Modal="true" Behaviors="Close,Move" VisibleStatusbar="false" Title="Add Service" DestroyOnClose="true">
            <Windows>
                <telerik:RadWindow ID="rdwAddService" runat="server" Title="Editing record" ReloadOnShow="true"
                    ShowContentDuringLoad="false" Modal="false" DestroyOnClose="true" />
            </Windows>
        </telerik:RadWindowManager>
    </telerik:RadAjaxPanel>
    <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" OnAjaxRequest="RadAjaxManager1_AjaxRequest" RequestQueueSize="0">
         <ClientEvents OnResponseEnd="responseEnd" />
        <AjaxSettings>
            <telerik:AjaxSetting AjaxControlID="RadAjaxManager1">
                <UpdatedControls>
                    <telerik:AjaxUpdatedControl ControlID="grdTL" />
                     <telerik:AjaxUpdatedControl ControlID="grdTR" />
                </UpdatedControls>
            </telerik:AjaxSetting>
        </AjaxSettings>
    </telerik:RadAjaxManager>

 function RefreshGrid(SubServiceType) {

                if (SubServiceType == "TR") {
                             $find("<%=RadAjaxManager1.ClientID%>").ajaxRequestWithTarget( '<%= btnRefreshTRGrid.UniqueID %>', '');
                }
                else if (SubServiceType = "TL") {
                             $find("<%=RadAjaxManager1.ClientID%>").ajaxRequestWithTarget( '<%= btnRefreshTLGrid.UniqueID %>', '');
                }
            }

**

Now problem is
In IE9,after opening/closing radwinow five-six times,
1)does not load radwindow again, like application hangout
2)Other button stops working
3)On refersh page, application hangout and need to close browser instance.

**

any help would be appreciated.

I solved issue of IE9 browser crash.

Problem is I am attaching close event of radwindow to pageLoad() function,so every postback, close function attached (ex 4 times) and called 4 times and in script grid are refreshing, so 4 times grid are refreshing and crashes application.

incorrect
    function pageLoad() {
            GetRadWindow().add_close(CallFnOnParent);
                }

Solution is Use Sys.Application.add_init function so, it is attach close event only first time and remove close event before close event.

correct
      Sys.Application.add_init(function () {
                    // Initialization code here, meant to run once.
                     GetRadWindow().add_close(CallFnOnParent);
                });