class Padrino::Helpers::FormBuilder::AbstractFormBuilder

def hidden_field(field, options={})

f.hidden_field :session_id, :value => "45"

def hidden_field(field, options={})
  options.reverse_merge!(:value => field_value(field), :id => field_id(field))
  @template.hidden_field_tag field_name(field), options
end