Redmine

Hello everyone,
I'm developing a plugin for test. I would like to know how to set my code for add new permissions. My code (not working) is as follows:

File inti.rb:

Redmine::Plugin.register :redmine_myload do
  name 'Plugin'
  author 'Who'
  description 'plugin'
  version '0.0.1'

  permission :my_menu, {:myload => [:index, :mytable, :logged, :insert, :error_set, :show]}
  permission :my_user, {:myload => [:present, :my, :call]}
  menu :top_menu, :myload, { :controller => 'myload', :action => 'index' }, :caption => 'Myload'

end

On mycontroller:

before_filter :authorize, :only => :index

when i set the permissions (like admin user ) and when the user try to use myload, redmine tells the error "do not have permission"

Someone can help me?
Thank you