<com:TContent ID="Content"> <com:Application.pages.Ticket284Component ID="fooBar" ShowHours="true" ShowMinutes="true" /> <com:TCustomValidator ControlToValidate="fooBar" OnServerValidate="checkUserAvailability" Display="Dynamic" Text="Unavailable." CssClass="inlineError" /> <com:TButton Text="POST it!" /> </com:TContent>