Combine AJAX Control ToolKit Tab with user control

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajaxToolkit" %>
<%@ Register Src="~/UserControls/FlightControl.ascx" TagName="FlightControl" TagPrefix="uc1" %>

<ajaxToolkit:TabContainer ID="TabContainer1" runat="server">
    <ajaxToolkit:TabPanel ID="TabPanel1" runat="server" HeaderText="Flights">
        <ContentTemplate>
            <uc1:FlightControl id="FlightControl1" Runat="server" />
        </ContentTemplate>
    </ajaxToolkit:TabPanel>
</ajaxToolkit:TabContainer>

<ajaxToolkit:TabContainer ID="TabContainer1" runat="server">
    <ajaxToolkit:TabPanel ID="TabPanel1" runat="server" HeaderText="Flights">
        <ContentTemplate>
            <uc1:FlightControl id="FlightControl1" Runat="server" />
            <uc1:FlightControl id="FlightControl2" Runat="server" />
        </ContentTemplate>
    </ajaxToolkit:TabPanel>
</ajaxToolkit:TabContainer>