Rails - Mar 2006 - render_to_string() in a controller that isn''t default route?

Is it possible to call render_to_string() in a controller that is not 
set as the default route?

The content controller is set in routes.rb: map.connect '''',
:controller
=> "content".  The content controller is calling a template
controller,
and I would like to be able to call render_to_string() within the 
template controller, however I receive the error:

     undefined method `render_to_string'' for TemplateController:Class

I''ve tried directly require()''ing the ActionController Base
class file
which defines the render_to_string function (not a solution I would want 
to use - that was more out of curiousity), and that didn''t work.

Thanks in advance.

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