[flexcoders] problem on using loaded font in Chinese in LinkBar

[bsyyu]

I encounter the problem on using swf Chinese font type with chinese
charater in LinkBar with fontFamily. The font doesn't apply and just
show the system font. However, it is OK, for 'English text' English
font swf at same setting. 
I also test using Label or LinkButton, on using Chinese font type with
chinese character, both of them works well.
Is there any idea why this happens and how to solve this.