def company_breadcrumb (action)
    referential_breadcrumb
    add_breadcrumb Chouette::Company.model_name.human(:count => 2), referential_companies_path(@referential) unless action == :index
    add_breadcrumb breadcrumb_label(@company), referential_company_path(@referential, @company),:title => breadcrumb_tooltip(@company) if action == :edit