Nested AjaxPanels & Repeaters problems

[Petar]

I have this setup in witch i dynamically add controls. I have tried to put AjaxManagerProxy but it didn't work.

Sys.WebForms.PageRequestManagerServerErrorException: Script control 'PnlItems' is not a registered script control. 
Script controls must be registered using RegisterScriptControl() before calling RegisterScriptDescriptors().
Parameter name: scriptControl

<%--Main page--%>
<telerik:RadAjaxPanel ID="RadAjaxPanel1" runat="server">
    <asp:Repeater ID="RptItems" runat="server">
        <ItemTemplate>
            <cs:customitem id="CustomItem1" runat="server" />
        </ItemTemplate>
    </asp:Repeater>
    <asp:Button ID="BtnAddItem" runat="server" OnClick="BtnAddItem_OnClick" />
</telerik:RadAjaxPanel>

 <%--Custom control--%>
<telerik:RadAjaxPanel ID="PnlItems" runat="server">
    <asp:Repeater ID="RptItems" runat="server">
        <ItemTemplate>
            <asp:TextBox ID="TxtName" runat="server" />
        </ItemTemplate>
    </asp:Repeater>
    <asp:Button ID="BtnAddItem" runat="server" OnClick="BtnAddItem_OnClick" />
</telerik:RadAjaxPanel>

[Maria Ilieva]

Hello,

Please try to replace the RadAjaxPanel controls with regular asp UpdatePanels and see how it goes on this case.

Regards,
Maria Ilieva
Telerik