ajax control toolkit - calender extender doesn't work on server

i'm working on a ASP.NET WebApplication using VS2012 .NET 4.5  i'm using ajax control toolkit ... & it seems to run well on my development mahcine ..

after deployement on either my local IIS or the remote one .. all pages seems to run fine except for those which has crystalreportviewer & ajax controls on the same page !

crystal reportviewer is not working either ! so i'm stuck in there & i can't find the reason why ajax don't work on this page !

here's my HTML ...

<asp:Content ID="Content5" ContentPlaceHolderID="SheetContentsPlaceHolder" runat="server"><asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><asp:UpdatePanel ID="UpdatePanel1" runat="server"><ContentTemplate><table style="width: 100%;"><tr><td><div style="width: 100%; align-content: center; align-items: center; align-self: center;"><fieldset style="align-content: center; align-items: center; align-self: center; vertical-align: middle;"><legend>Report Filters</legend>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                                Time Period Start :&nbsp;<asp:TextBox ID="txtStartingTimePeriod" runat="server" CssClass="txtStyle" Width="100px" />&nbsp;&nbsp;&nbsp; -&nbsp;&nbsp;&nbsp;<asp:CalendarExtender ID="CalendarExtender1" TargetControlID="txtStartingTimePeriod" FirstDayOfWeek="Sunday" Animated="true" runat="server"></asp:CalendarExtender>
                                Time Period End :&nbsp;&nbsp;<asp:TextBox ID="txtEndingTimePeriod" runat="server" CssClass="txtStyle" Width="100px" /><asp:CalendarExtender ID="CalendarExtender2" runat="server" Animated="true" TargetControlID="txtEndingTimePeriod" FirstDayOfWeek="Sunday"></asp:CalendarExtender>&nbsp;&nbsp;&nbsp;<asp:Button ID="btnLoadReport" runat="server" Text="Load Report Data" OnClick="btnLoadReport_Click" /></fieldset></div></td></tr><tr><td><CR:CrystalReportViewer ID="CrystalReportViewer1" runat="server" AutoDataBind="true"
                            EnableDatabaseLogonPrompt="False" EnableParameterPrompt="False"
                            Height="50px" ReportSourceID="CrystalReportSource1" ToolPanelWidth="200px" Width="350px"
                            HasRefreshButton="True" HasDrilldownTabs="True" HasExportButton="True"
                            HasPrintButton="True" HasSearchButton="True" /><CR:CrystalReportSource ID="CrystalReportSource1" runat="server"><Report FileName="..\CRM\rpt_CRMReports\PurchaseOrdersDetailedReport.rpt"></Report></CR:CrystalReportSource></td></tr><tr><td><div id="divErrorMessages" runat="server" style="width: 100%; text-align: center;"></div></td></tr></table></ContentTemplate></asp:UpdatePanel></asp:Content>

it's working when i run it from vs2012 not on my local iis or the remote server !!