Hi,
For me the icon is visible (pnlStart icon) under IE and FF, just be sure that you use correct image url
Another nodes can use custom icon via own id
<%@ Page Language="C#" ValidateRequest="false" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>Ext.NET Example</title>
<style type="text/css">
.startIcon .x-tab-first a.x-grouptabs-expand{
background: url(/icons/basket-png/ext.axd) no-repeat !important;
}
.startIcon .x-tab-first ul.x-grouptabs-sub{
display:none;
}
#GroupTabPanel1__gtHome2 a.x-grouptabs-expand{
background: url(/icons/cart-png/ext.axd) no-repeat !important;
}
</style>
</head>
<body>
<form id="Form1" runat="server">
<ext:ResourceManager ID="ResourceManager1" runat="server" />
<ext:Viewport ID="Viewport1" runat="server" Layout="Fit">
<Items>
<ext:BorderLayout ID="BorderLayout1" runat="server">
<Center>
<ext:GroupTabPanel ID="GroupTabPanel1" runat="server" TabWidth="160"
ActiveGroupIndex="0" Cls="startIcon">
<Groups>
<ext:GroupTab ID="gtHome1" runat="server">
<Items>
<ext:Panel ID="pnlStart" runat="server" Title="Start" Layout="Fit" TabTip="Start"
Padding="5" Html="test">
</ext:Panel>
</Items>
</ext:GroupTab>
<ext:GroupTab ID="gtHome2" runat="server" MainItem="0">
<Items>
<ext:Panel ID="Panel2_1" runat="server" Title="Tab2_1" Layout="Fit" Padding="5" Html="test">
</ext:Panel>
<ext:Panel ID="Panel2_2" runat="server" Title="Tab2_2" Layout="Fit" Icon="Package"
Padding="5">
</ext:Panel>
</Items>
</ext:GroupTab>
</Groups>
</ext:GroupTabPanel>
</Center>
</ext:BorderLayout>
</Items>
</ext:Viewport>
</form>
</body>
</html>
