Help: Chinese charactor in Tkinter

[Zhenlei Jia]

I am trying to display Chinese charactor in Tkinter. The following is 
the code I've tried, but the texts were displied as "?". Had I missed
somthing, or just I can't do it on my system? I am using MacPython 2.0b1,
Tcl & Tk 8.3.0 on MacOS 8.6, I have installed Chinese Language Kit, and I
can display Chinese char in java, also using unicode.

Thanks in advance!

Zhenlei Jia
 
##my code

from Tkinter import *

root=Tk()

Label(root, text="abcd").pack()
Label(root, text=u"\u5413abcd", font=("Song", 12))

#\u5413 is a Chinese char, "Song" is a font installed on the mac 

Button(root, text=u'\u5413', font=("Beijing", 20)).pack()

#"Beijing" is another font

#'abcd' on two labels looks different from each other, so I know the
#Chinese font did have been used
 
root.mainloop()