Here is the code:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="ChampWeb.WebForm1" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<!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>
<script runat="server">
protected void btnClick(object sender, DirectEventArgs e)
{
this.imageButtonNextDisable.Disabled = false;
}
</script>
</head>
<body>
<form id="form1" runat="server">
<ext:ResourceManager ID="ResourceManager1" runat="server">
</ext:ResourceManager>
<ext:ImageButton ID="imageButtonNextDisable"
runat="server" Disabled="true"
ImageUrl="App_Themes/ChampWeb/Images/imaBtnStandar_Next_Out.png">
</ext:ImageButton>
<ext:ImageButton ID="ImageButtonNext" runat="server" Hidden="true"
ImageUrl="App_Themes/ChampWeb/Images/imaBtnStandar_Next_Out.png">
<DirectEvents>
<Click OnEvent="btnClick">
</Click>
</DirectEvents>
</ext:ImageButton>
</form>
</body>
</html>