Microsoft JScript runtime error: Object doesn't support property or method 'radopen'

[AAA]

I am attempting to open a radWindow from C# codebehind (using VS 2008, Telerik.Web.UI version 2012.2.724.35), however, I am getting this error:

Microsoft JScript runtime error: Unable to get value of the property 'open': object is null or undefined

My aspx code is:

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>

<script type="text/javascript">
    function OpenRadWindow() {
        var wnd = window.radopen("http://www.microsoft.com", null);
        wnd.setSize(300, 400);
        return false;
    }
</script>

The serverside code is: 

protected void Page_Load(object sender, EventArgs e)
{
    Page.ClientScript.RegisterStartupScript(this.GetType(), "getting data", "OpenRadWindow();", true);
}

What is causing the error?

[Marin Bratanov]

Hi,


I advise that you examine the following sticky thread on opening a RadWindow from the server: http://www.telerik.com/community/forums/aspnet-ajax/window/opening-radwindow-from-the-server.aspx. It explains how injecting a script is done properly by using the Sys.Application.Load event. With the current snippet the script is executed too early for the script controls to have been initialized.


Regards,
Marin Bratanov
the Telerik team