RadTabStrip + RadMultiPage + RadAjaxPanel Problem

[Sachita]

Migarted  Classic RadTabstrip to Ajax Suite, after that not able to view tabstrips.Using Telerik R32020 version with .Net Framework 4.8.

<telerik:RadAjaxPanel runat="server">
            <div style="float: left">
                <telerik:RadTextBox runat="server" EmptyMessage="Enter Tag" ID="TagName" MaxLength="255" ClientEvents-OnKeyPress="AddTag">
                </telerik:RadTextBox>
               
        </telerik:RadAjaxPanel>
    </div>
    <div class="bds_section clear">
        <telerik:RadTabStrip ID="RadTabStrip1" Skin="MyCustomSkin" EnableEmbeddedSkins="False" CausesValidation="False" MultiPageID="RadMultiPage1" SelectedIndex="0" runat="server" >
            <Tabs>
                <telerik:RadTab PageViewID="SummaryPageView" meta:resourceKey="ChangeSummaryTab" runat="server"></telerik:RadTab>
                <telerik:RadTab PageViewID="DetailPageView" Visible="false" meta:resourceKey="CurrentRecordTab" runat="server"></telerik:RadTab>
                <telerik:RadTab PageViewID="DuplicatesPageView" ForeColor="Red" Visible="false" meta:resourceKey="DuplicatesTab" runat="server"></telerik:RadTab>
            </Tabs>
        </telerik:RadTabStrip>
        <telerik:RadMultiPage id="RadMultiPage1" runat="server" SelectedIndex="0">
            <telerik:RadPageView ID="SummaryPageView" runat="server">
               
            </telerik:RadPageView>
        <telerik:RadPageView id="DetailPageView" runat="server">

         </telerik:RadPageView>
            <telerik:RadPageView id="DuplicatesPageView" runat="server">
            </telerik:RadPageView>
        </telerik:RadMultiPage>

RadTabstrip is not rendered in the Page and no data is shown related to the control .No errors in the console.

Attached screenshot(TabStrip.png) is the Expected view when using Classic RadTabstrip.

But its not working in Ajax suite Controls.

Can anyone please help what is causing issue?