problem with UpdateProgress

Hello,

          UpdateProgress is not working inside AJAX tab panel Control. What Code change I do to solve this problem.

I have written the following code

<ajaxToolkit:TabContainer ID="TabContainer1" runat="server" AutoPostBack="true" ActiveTabIndex="1"
            OnActiveTabChanged="TabContainer1_ActiveTabChanged"><ajaxToolkit:TabPanel ID="tb_home" runat="server" HeaderText="Home"></ajaxToolkit:TabPanel><ajaxToolkit:TabPanel ID="TabPanel1" runat="server" HeaderText="CSR Registration Process"><ContentTemplate><asp:UpdateProgress runat="server" ID="UpdateProgress1" AssociatedUpdatePanelID="TabContainer1_TabPanel1_up_addupdt"><ProgressTemplate><div id="myModal" class="modal"><!-- Modal content --><div class="modal-content"><b>Please wait.......</b></div></div></ProgressTemplate></asp:UpdateProgress><asp:UpdatePanel ID="up_addupdt" runat="server" UpdateMode="Conditional"><ContentTemplate><table><tr id="tr_call_No" runat="server" visible="false"><td>CSR No.:</td><td colspan="3"><asp:Label ID="lbl_call" runat="server" CssClass="lbl_text" Text=""></asp:Label></td></tr><tr><td style="width: 200px;">Request System:</td><td style="width: 200px;"><asp:DropDownList ID="drop_system" runat="server" Width="180px" CssClass="dropdown1"
                                            OnSelectedIndexChanged="drop_system_SelectedIndexChanged"
                                            AutoPostBack="true" ValidationGroup="first"><asp:ListItem Text="Select Request System" Value="0"></asp:ListItem></asp:DropDownList></ContentTemplate><Triggers><asp:PostBackTrigger ControlID="btn_save" /><asp:AsyncPostBackTrigger ControlID="drop_system" /><asp:AsyncPostBackTrigger ControlID="drop_req_type" /></Triggers></asp:UpdatePanel></ContentTemplate></ajaxToolkit:TabPanel></ajaxToolkit:TabContainer>

Thanks

Regards

Anoop Mathur