Thanks my frindes ....
This is my try :
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<style type="text/css">
.pnl
{
background-color:#CFCFCF;
border:1px solid #CECECE;
color:#CF0000;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<cc1:toolkitscriptmanager id="ToolkitScriptManager1" runat="server" xmlns:cc1="#unknown">
</cc1:toolkitscriptmanager>
<div>
<asp:panel id="Panel1" runat="server" cssclass="pnl" width="256px" xmlns:asp="#unknown">
<input type="button" value="button2" id="btn2" />
</asp:panel>
<cc1:hovermenuextender id="HoverMenuExtender1" runat="server" behaviorid="hmeBehaviour" xmlns:cc1="#unknown">
PopupPosition="Bottom" TargetControlID="LinkButton1" PopupControlID="Panel1">
</cc1:hovermenuextender>
<asp:linkbutton id="LinkButton1" runat="server" xmlns:asp="#unknown">LinkButton</asp:linkbutton>
</div>
</form>
</body>
</html>