Filtering a templating component

Hi All!

My sample app uses a ‘main’ layout (specified in application
controller),
so my controllers’ views .rhtml template snippets are included in the
template structure (in the rendered page).
I would like to filter only this rhtml response part (without
workarounds) using Rails natural filtering mechanism and filter
inheritance; not the whole response.body.
(like at the perl based HTML::Mason framework)
Any ideas?

Rails v1.2.6

thanks