Hi,
Please look at the example.
Example
<%@ Page Language="C#" %>
<%@ 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>Ext.Net Example</title>
</head>
<body>
<form runat="server">
<ext:ResourceManager runat="server" />
<ext:ComboBox ID="ComboBox1" runat="server" LazyInit="false">
<Items>
<ext:ListItem Text="Item 1" Value="1" />
<ext:ListItem Text="Item 2" Value="2" />
</Items>
</ext:ComboBox>
<ext:ToolTip
runat="server"
Target="={#{ComboBox1}.list}"
Delegate=".x-combo-list-item"
TrackMouse="true">
<Listeners>
<Show Handler="this.body.update(this.triggerElement.outerText);" />
</Listeners>
</ext:ToolTip>
</form>
</body>
</html>
See also
http://forums.ext.net/showthread.php...it-Version-0.8