Thanks again sabby, but just check this site:sabby2612 said:yes, it makes you eligible for 3 years PGWP.
http://www.cic.gc.ca/english/resources/manuals/bulletins/2010/ob194.asp
See the follow paragraph:
So, it can be understand that a diploma + diploma can allow 3 years PGWP, but dont say nothing about diploma + certificate program =(Revised program criteria
Students holding a one‑year graduate degree or diploma from a provincially or territorially accredited post‑secondary educational/training institution in Canada after having obtained, within the prior two years, a diploma or degree from an accredited post‑secondary educational/training institution in Canada may qualify for a three‑year work permit. This exception also applies to students who have left Canada temporarily between programs of study.