Use the EnableTheming property to prevent a Skin from being applied. File: Simple\Calendar.skin <asp:Calendar BackColor="White" BorderColor="White" BorderWidth="1px" Font-Names="Verdana" Font-Size="9pt" ForeColor="Black" NextPrevFormat="FullMonth" Width="400px" Runat="Server"> <SelectedDayStyle BackColor="#333399" ForeColor="White" /> <OtherMonthDayStyle ForeColor="#999999" /> <TodayDayStyle BackColor="#CCCCCC" /> <NextPrevStyle Font-Bold="True" Font-Size="8pt" ForeColor="#333333" VerticalAlign="Bottom" /> <DayHeaderStyle Font-Bold="True" Font-Size="8pt" /> <TitleStyle BackColor="White" BorderColor="Black" BorderWidth="4px" Font-Bold="True" Font-Size="12pt" ForeColor="#333399" /> </asp:Calendar> File: ShowEnableTheming.aspx <%@ Page Language="C#" Theme="Simple" %> <html xmlns="http://www.w3.org/1999/xhtml" > <head runat="server"> <title>Show EnableTheming</title> </head> <body> <form id="form1" runat="server"> <div> <asp:Calendar id="Calendar1" Runat="server" /> <br /><br /> <asp:Calendar id="Calendar2" EnableTheming="false" Runat="server" /> </div> </form> </body> </html>