problem of 3d display refresh

Hi there,
We finished our project in which we use Visad to realize 3D display. But there is a problem. when we click display on/of button on control panel or switch to another JFrame, the 3D visualization does not return. I think this is may be a refresh problem, but I'm not sure.
Our project can be accessed at
username: zhang
password: 111111
(By the way, we use Java web start technology to launch the application)
Have a good weekend

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