TextSymbol method setText with some special  text e.g "???" display nothing in sdk 10.2

Discussion created by lzh_sx on Nov 2, 2013
Latest reply on Nov 6, 2013 by ESoekianto-esristaff
Hi all !
I want to display some special  text e.g "???"  use Graphic with TextSymbol , it works well in sdk 10.1 , but I update sdk to 10.2, it display nothing on screen , new method setFontFamily in class TextSymbol how to use , what can I do.
Thank you all !