Cannot unregister UpdatePanel with ID 'UpdatePanel1' since it was not registered with the ScriptManager

[Mitchell Ang]

I encountered the 

'Cannot unregister UpdatePanel with ID 'UpdatePanel1' since it was not registered with the ScriptManager'

error when using a Content Place Holder, within one of the ItemTab, and when another content page using UpdatePanel being placed in the ContentPlaceHolder.

Can someone help provide me the resource or example to add a content with update panel into a TabItem?

Code below:

Master.master (All header and everything else works fine)

            <div style="z-index: 400;">

                <ej:Tab ID="TabStrip1" runat="server">

                    <Items>

                        <ej:TabItem>

                            <HeaderSection>

                                <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"></asp:ContentPlaceHolder>

                            </HeaderSection>

                            <ContentSection>

                                <ej:Menu ID="MenuLTE" runat="server"></ej:Menu>

                            </ContentSection>

                        </ej:TabItem>

                    </Items>

                </ej:Tab>

            </div>

Default.aspx

<%@ Page Title="" Language="VB" MasterPageFile="~/MasterPage.master" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>

<%@ MasterType VirtualPath="MasterPage_Test.master" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

    <asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">

    <ContentTemplate>

        <asp:Calendar ID="Calendar1" runat="server"></asp:Calendar>

    </ContentTemplate>

</asp:UpdatePanel>

</asp:Content>

[Keerthana Rajendran]

 

Hi Mitchell, 

 

Sorry for the inconvenience caused.  

 

We cannot use the update panel inside tab item’s content due to the changes in our control. To provide the support it requires redefining of entire control’s structure. So, we suggest you to use tab control inside update panel. Please let us know if you face any issues after the implementing our suggestion.  

 

Regards, 

Keerthana.