class SimpleForm::FormBuilder

def button(type, *args, &block)
  options = args.extract_options!.dup
  options[:class] = [SimpleForm.button_class, options[:class]].compact
  args << options
  if respond_to?("#{type}_button")
    send("#{type}_button", *args, &block)
  else
    send(type, *args, &block)
  end
end