[XeTeX] How to change font name of beamer frametitle ?

[Sun Yongke]

\usetheme{Warsaw}

How to change font name of beamer frametitle ?
-- 
Sun Yongke
孙永科
Tel: 15808796485



--------------------------------------------------
Subscriptions, Archive, and List information, etc.:
  http://tug.org/mailman/listinfo/xetex