Problem in Swing tree root node when displaying Japanese

I'm trying to create a tree using DefaultTreeModel. The root node will display text in Japanese and the other child nodes are in English. My problem is the root node fails to show Japanese correctly (only squares are shown).
I've already set my font.properties.ja to display Japanese font for virtual font "dialog":
dialog.plain.0=Arial,ANSI_CHARSET
dialog.plain.1=\uff2d\uff33 \u30b4\u30b7\u30c3\u30af,SHIFTJIS_CHARSET
dialog.plain.2=WingDings,SYMBOL_CHARSET,NEED_CONVERTED
dialog.plain.3=Symbol,SYMBOL_CHARSET,NEED_CONVERTED
And I've checked the "Tree.font" of UIManager is:
Tree.font = javax.swing.plaf.FontUIResource[family=dialog,name=Dialog,style=plain,size=12]
I'm quite sure that my font.properties.ja is correct as all message dialogs in my app. shows Japanese correctly (also using the same dialog font).
I got stuck. Can anyone please give me some advice? Thanks in advance.

hello!
first of all i am sorry that i cannot help u.
i am a java developer and start work on
Arabic ( one of the langugae supported by
unicode) text editing.If u have any knowledge that
what i should do to display the text in this language
in a textarea.when i run a code,this display only
square.
plz help me.i will be realy thankful to u.
Qaiser Mehmood
[email protected]

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