For the time being you can use the following CSS workaround: <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> <style> .RadForm.rfdButton input[disabled="disabled"].rfdDecorated { background-position: left -22px !important; } </style> </head> <body> <form id="form1" runat="server"> <telerik:RadScriptManager ID="RadScriptManager1" runat="server"></telerik:RadScriptManager> <telerik:RadFormDecorator ID="RadFormDecorator1" runat="server" DecoratedControls="All" /> <asp:Button ID="Button1" Text="text" runat="server" Enabled="false" /> </form> </body> </html>