ASP.NET AjaxControlToolkit COMBOBOX - rendering error

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hello,
I am using the ComboBox from the AjaxControlToolkit 15.1 in VS2013. However I getting the following error in design mode when I drag the scriptmanager and comboBox to the webform:

ComboBox - ComboBox1

there was an error rendering the control.

Value cannot be null. Parameter name: stream

When I try running it the dropdown appears outside of the textbox. Can anyone tell me what the problem is. Tried changing the Render mode to Block , but this does not resolve the issue. Call ComboBox definition below

any help would be very much appreciated

regards
Pat

XML

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication1.WebForm1" %>

<%@ Register assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" tagprefix="cc1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div style="height: 19px">

        <asp:ScriptManager ID="ScriptManager1" runat="server">
        </asp:ScriptManager>

    </div>
        <cc1:ComboBox ID="ComboBox1" runat="server">
        </cc1:ComboBox>
    </form>
</body>
</html>

Posted 21-May-15 5:00am

PClarkeirl

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