Rails - Jul 2006 - acts_as_nested_set and acts_as_threaded

I''m trying to use acts_as_nested_set, as modifed by Bob Silva to add 
threaded functionality. I''m getting the following error:

undefined method `display_threads'' for
#<PostController:0x3ae9828>
...
#{RAILS_ROOT}/app/controllers/post_controller.rb:18:in `list''

Line 18 in post_controller.rb shows:

[post_controller.rb]
  def list
    display_threads @posts  <= line 18
    @post_pages, @posts = paginate :posts, :per_page => 10, :order => 
"root_id      desc, lft"
  end

The display_threads method is defined in:

[post_helper.rb]
module PostHelper
  def display_threads (threads)
  (snipped)
  end
end

My understanding is that Helper code is merged with Controller code. I 
wonder then why Rails can''t find the method display_threads.

Thanks for your help.
gk

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