multilanguge problem (style-rtl.css dont work)

Hi dears:
I used TB Nucleus as my drupal them which must be one multi-languagal site with rtl support but Tb nucleus theme sources don't work with style0rtl.css pattern and don't change the css when i switch to some rtl language so where comes from this problem?
Similar question is :
http://www.themebrain.com/question/rtl-support
you could see the site in :http://drush-drupal4ss.rhcloud.com which use zicorn
sincerely yours.