see the sample:
------------------------------------------------------------------------------
<!
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>Decorate button</title>
<script type="text/javascript">
function
pageLoad() {
}
function
show_div()
{
var div = $get("divContainer");
div.style.display=
"";
}
</script>
</
head>
<
body>
<form id="form1" runat="server">
<telerik:RadScriptManager ID="RadScriptManager1" runat="server">
</telerik:RadScriptManager>
<telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" />
<div style="display:none;" id="divContainer">
<div style="padding:3px;">
<span>
<input id="btnLoginOk" type="button" value="Conferma"/>
</span>
<span>
<input id="btnLoginCancel" type="button" value="Annulla" title="" />
</span>
</div>
</div>
<input id="btnShow" type="button" value="Show" onclick="show_div();" />
</form>
</
body>
</
html>