need help about data update

Hi there,
 
  Recently, I'm designing 3D terrain program by usingVisAD class library. This program includes 2D and 3D area. Each of them in the different JFrame. When the user select area of 2D, there will be a correspondence 3D display. But I found that I can't update 3D display currently showing without closing the program. (It just accept data only once. If I have new data, it doesn't accept)
  Could you please give me any hint that can help me to update 3D display.   This is a urgent project. I really need your help.
 
Very appreciate!
 
Jing


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