Rails - Apr 2007 - A plugin that responds to an action

yo.  creating first plugin.
Is it not possible to create a plugin that defines controller actions?

<code>
module Foo
    def on_callback
        render_text ''foo'', :layout => false
    end
end
ActionController::Base.send(:include, Foo)
.
.
.
http://url:3000/controller/on_callback
"ActionController::UnknownAction (No action responded to
on_callback):"
</code>

but the following *will* work:
<code>

def ApplicationController < ActionController::Base
    include Foo
end
.
.
.
http://url:3000/controller/on_callback
''foo''
</code>

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I found the answer to my question here
http://www.robbyonrails.com/xml/atom/article/22486/feed.xml

see "un-hiding actions" at bottom of page.

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