or
<add key="Telerik.Web.SkinsAssembly" value="MySkinAssembly" /><add key="Telerik.Skin" value="MySkin" /><add key="Telerik.EnableEmbeddedSkins" value="false" /><RadStylesheetManager ...>
<StyleSheets>
<StyleSheetReference Name="MySkinAssembly.MySkinNamespace.Button.MySkin.css" Assembly="MySkinAssembly" />
</StyleSheets>
</RadStylesheetManager><telerik:AjaxSetting AjaxControlID="ProblematicArea"> <UpdatedControls> <telerik:AjaxUpdatedControl ControlID="ProblematicArea" LoadingPanelID="LoadingPanel" /> </UpdatedControls></telerik:AjaxSetting><asp:Panel ID="ProblematicArea" runat="server" > <asp:PlaceHolder Runat="server" ID="DynamicControls"></asp:PlaceHolder></asp:Panel>