to test I created a brand new application with just one page with a loading panel and a button. The image never appears.
Here is my code:
<%
@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" Inherits="_Default" %>
<%
@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>
<%
@ Register assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" namespace="System.Web.UI" tagprefix="asp" %>
<!
DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<
html xmlns="http://www.w3.org/1999/xhtml">
<
head runat="server">
<title>Untitled Page</title>
</
head>
<
body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" Runat="server"
height="75px" width="75px" IsSticky="True" MinDisplayTime="10">
<img alt="Loading..."
src="loading-spiral.gif"
style="border:0px;" />
</telerik:RadAjaxLoadingPanel>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</
body>
</
html>
And the code behind:
Partial
Class _Default
Inherits System.Web.UI.Page
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
System.Threading.Thread.Sleep(2000)
End Sub
End
Class