Workarounds: - use RenderMode="Lightweight" - OR, set DecoratedControls="All" Repro: <telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" DecoratedControls="Textbox,Textarea,Buttons,Scrollbars,Select,CheckBoxes,RadioButtons" Skin="Default" RenderMode="Classic" /> <div class="container body-content"> <h2>First Application </h2> <p>SFSFSDF</p> <br /> <asp:RadioButtonList runat="server" ID="dlSchdId" RepeatColumns="6" RepeatDirection="Horizontal" Width="100%"> <asp:ListItem Text="test 1"></asp:ListItem> <asp:ListItem Text="test 2"></asp:ListItem> </asp:RadioButtonList> <asp:CheckBox runat="server" ID="chk1" Text="Check Box 1" /> </div>