Invisible avatar

I've got a problem with the graphic representation of ViewPlatform. I use several viewers in my program. The first ViewPlatform is invisible. I can move it but I can't see it. All the next ViewPlatforms that I add to the graph, but the first, have avatar. I'll attach the code that I use so that someone could help me.
BranchGroup bg = new BranchGroup();
TransformGroup tg = new TransformGroup();
bg.addChild(tg);
ViewPlatform vp = new ViewPlatform();
tg.addChild(vp);
View view = new View();
GraphicsConfigTemplate3D gconfigTempl = new GraphicsConfigTemplate3D();
GraphicsConfiguration gconfig =
            GraphicsEnvironment.getLocalGraphicsEnvironment().
            getDefaultScreenDevice().
            getBestConfiguration(gconfigTempl);
Canvas3D canvas3D = new Canvas3D(gconfig);
PhysicalBody pbody = new PhysicalBody();
PhysicalEnvironment penvironment = new PhysicalEnvironment();
view.addCanvas3D(canvas3D);
view.setPhysicalBody(pbody);
view.setPhysicalEnvironment(penvironment);
view.attachViewPlatform(vp);
ColorCube colorCube = new ColorCube(0.5);
tg.addChild(colorCube);Thank you! And I'm sorry if my English isn't very good...

I want to add something to my last post... I can see the first camera through the second camera!!

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