Hi Roland,
I am not sure how you reproduce the problem. Here is a demo, which works. Feel free to modify it and send it back for further inspection.
<%@ Page Language="C#" %>
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
<head runat="server">
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<title>RadControls</title>
<style type="text/css">
html,body,form
{
height:100%;
margin:0;
padding:0;
}
</style>
</head>
<body>
<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server" />
<telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" DecoratedControls="Buttons" />
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
<AjaxSettings>
<telerik:AjaxSetting AjaxControlID="btnDoStuff">
<UpdatedControls>
<telerik:AjaxUpdatedControl ControlID="pnlMainNav" UpdatePanelHeight="100%" />
</UpdatedControls>
</telerik:AjaxSetting>
</AjaxSettings>
</telerik:RadAjaxManager>
<asp:Button ID="btnDoStuff" runat="server" Text="do stuff" />
<telerik:RadPanelBar ID="pnlMainNav" runat="server" Width="100%" Height="100%" ExpandMode="FullExpandedItem">
<Items>
<telerik:RadPanelItem Text="Item 1" Expanded="true">
<Items>
<telerik:RadPanelItem Text="sub item 1" />
<telerik:RadPanelItem Text="sub item 2" />
<telerik:RadPanelItem Text="sub item 3" />
</Items>
</telerik:RadPanelItem>
<telerik:RadPanelItem Text="Item 2">
<Items>
<telerik:RadPanelItem Text="sub item 1" />
<telerik:RadPanelItem Text="sub item 2" />
<telerik:RadPanelItem Text="sub item 3" />
</Items>
</telerik:RadPanelItem>
<telerik:RadPanelItem Text="Item 3">
<Items>
<telerik:RadPanelItem Text="sub item 1" />
<telerik:RadPanelItem Text="sub item 2" />
<telerik:RadPanelItem Text="sub item 3" />
</Items>
</telerik:RadPanelItem>
<telerik:RadPanelItem Text="Item 4">
<Items>
<telerik:RadPanelItem Text="sub item 1" />
<telerik:RadPanelItem Text="sub item 2" />
<telerik:RadPanelItem Text="sub item 3" />
</Items>
</telerik:RadPanelItem>
</Items>
</telerik:RadPanelBar>
</form>
</body>
</html>
Regards,
Dimo
the Telerik team
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