I just can't get it:record_in, record_out(I know i try to do something postgres is not developed for but there are many 'buts')

This is what i can't get right:

CREATE type tst_tst as (a integer, b text);

CREATE OR REPLACE FUNCTION tst_store(a anyelement) RETURNS text AS $$
BEGIN
RETURN textin(record_out(a));
END
$$ LANGUAGE PLPGSQL;

create or replace function tst_load1(a text) returns tst_tst as $$
declare
b tst_tst;
c text;
begin
c := record_in(textout(a), 'tst_tst'::regtype::oid, 0);
c := 'select row' || c || '::tst_tst';
raise notice 'boza:%', c;
execute c into b;
return b;
end
$$ language plpgsql;

Somebody help please

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