<com:TContent ID="Content"> <h1>Prado CustomValidator Tests</h1> <script type="text/javascript"> var MyCustomValidator = { validate : function(sender, value) { return value == "Prado"; } } </script> <div> <com:TTextBox ID="text1" /> <com:TCustomValidator ID="validator1" ControlToValidate="text1" ErrorMessage="Enter 'Prado'" ControlCssClass="required" ClientValidationFunction="MyCustomValidator.validate" OnServerValidate="CustomValidation" /> <com:TButton ID="submit1" Text="Test" /> </div> </com:TContent>