3D displays flicker?

I've noticed that the 2D examples in the tutorial do not flicker when I resize 
the JPanel window.

However, the 3D examples do show a distinct flicker when they are resized.

Is there any way to control this?  I thought Java3D 1.2 supported double-
buffering (though I'm not sure this is a VisAD or Java3D issue, but perhaps is 
a Swing or AWT issue).

Any suggestions would be helpful.
Thanks in advance.