define(['jQuery', 'jquery.validate', 'jquery.validate.unobtrusive'], function () {
    $.validator.unobtrusive.adapters.add("requirechecked", [],
        function (options) {
            options.rules['requirechecked'] = 'requirechecked';
            options.messages['requirechecked'] = options.message;
        }
    );
    $.validator.addMethod("requirechecked", function (value, element, e) {
        return $(element).is(':checked');
    });
});