How can I let nanogui support Chinese characters?

[jhyvictory]

I changed the button's text to Chinese characters, such as "按钮". However the button appeared with no characters on it.
Then I copied some font ttf files to the the resource folder of nanogui, rebuilt it, the button still had no characters on it.
How can I let nanogui support Chinese characters?

[jhyvictory]

Seem no one cares about what is happening here.
I inherit the Theme class to MyTheme, and read a new font file through nvgCreateFont function. Then apply MyTheme to the Window. Finally I can show a label with Chinese font by defining it with the font parameter. However, other widgets like Button don't have that parameter and the font used is fixed in code of drawing a button. I changed the fixed font of drawing a button while I really dont want to. It seems that nanogui cannot support Chinese font in a pretty way without reproduce its code...a pity!