Chinese character problem on flex pendant application.

Hello everyone.
I've developed a VS application to run in a flex pendant. The application can be used in many languages, to do his I use a resx file for each language and all works fine. I change the flex pendant language and my application use the correct resx file. The problem is when i change the flex pendat language in chinese: in my application I see a square for each ideogram and not the correct chinese character. I've use the same version of robotware of the robot to build the application. Any suggestions?

Thanks a lot