Exception when using dual head

I ssaw a similar message on another group, but it didn't get a
response, but I'm sure it is more of a 3D issue.

I create a JFrame and display it on the first screen.  Everything
works well until I move the frame to the 2nd screen.  Redrawing the
universe produces the following exception:

Exception in thread "AWT-EventQueue-0"
java.lang.IllegalArgumentException: adding a container to a container
on a different GraphicsDevice
	at java.awt.Component.checkGD(Unknown Source)
	at java.awt.Container.addImpl(Unknown Source)
	at java.awt.Container.add(Unknown Source)
	at com.issinc.sandbox.Java3DTest.redrawPanel(Java3DTest.java:95)
	at com.issinc.sandbox.Java3DTest.actionPerformed(Java3DTest.java:144)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
                ...

I've tried creating and getting the GraphicsConfiguration several
ways, but haven't found the right thing yet.

I'm getting this in our large application, but I recreated the
problemin the folowing code, based on the HelloUniverse example:



import com.sun.j3d.utils.universe.*;
import com.sun.j3d.utils.geometry.ColorCube;
import javax.media.j3d.*;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.vecmath.*;

import java.awt.FlowLayout;
import java.awt.GraphicsConfiguration;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

/**
 * Simple Java 3D example program to display a spinning cube.
 */
public class Java3DTest extends javax.swing.JFrame implements
ActionListener {

	private javax.swing.JPanel drawingPanel;
    private JPanel buttonPanel;
    private JButton redrawButton;

    private SimpleUniverse univ = null;
    private BranchGroup scene = null;

    private Canvas3D c;

    public BranchGroup createSceneGraph() {
		// Create the root of the branch graph
		BranchGroup objRoot = new BranchGroup();

		// Create the TransformGroup node and initialize it to the
		// identity. Enable the TRANSFORM_WRITE capability so that
		// our behavior code can modify it at run time. Add it to
		// the root of the subgraph.
		TransformGroup objTrans = new TransformGroup();
		objTrans.setCapability(TransformGroup.ALLOW_TRANSFORM_WRITE);
		objRoot.addChild(objTrans);

		// Create a simple Shape3D node; add it to the scene graph.
		objTrans.addChild(new ColorCube(0.4));

		// Create a new Behavior object that will perform the
		// desired operation on the specified transform and add
		// it into the scene graph.
		Transform3D yAxis = new Transform3D();

		yAxis.rotX(Math.PI/8.0d);

		Alpha rotationAlpha = new Alpha(-1, 4000);

		RotationInterpolator rotator =
		    new RotationInterpolator(rotationAlpha, objTrans, yAxis,
					     0.0f, (float) Math.PI*2.0f);
		BoundingSphere bounds =
		    new BoundingSphere(new Point3d(0.0,0.0,0.0), 100.0);
		rotator.setSchedulingBounds(bounds);
		objRoot.addChild(rotator);

        // Have Java 3D perform optimizations on this scene graph.
        objRoot.compile();

		return objRoot;
    }

    private Canvas3D createUniverse() {
		// Get the preferred graphics configuration for the default screen
		GraphicsConfiguration config =
		    SimpleUniverse.getPreferredConfiguration();

		// Create a Canvas3D using the preferred configuration
		c = new Canvas3D(config);

		// Create simple universe with view branch
		univ = new SimpleUniverse(c);

		// This will move the ViewPlatform back a bit so the
		// objects in the scene can be viewed.
		univ.getViewingPlatform().setNominalViewingTransform();

		// Ensure at least 5 msec per frame (i.e., < 200Hz)
		univ.getViewer().getView().setMinimumFrameCycleTime(5);

		return c;
    }

    private void redrawPanel() {
    	// Create Canvas3D and SimpleUniverse; add canvas to drawing
panel
		c = createUniverse();

		// Create the content branch and add it to the universe
		scene = createSceneGraph();
		univ.addBranchGraph(scene);
		drawingPanel.add(c, java.awt.BorderLayout.CENTER);
		drawingPanel.revalidate();
    }

    /**
     * Creates new form HelloUniverse
     */
    public Java3DTest() {
		// Initialize the GUI components
		initComponents();
    }

    //
----------------------------------------------------------------

    private void initComponents() {
        drawingPanel = new javax.swing.JPanel();

 
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Java 3D Test");
        drawingPanel.setLayout(new java.awt.BorderLayout());

        drawingPanel.setPreferredSize(new java.awt.Dimension(250,
250));
        getContentPane().add(drawingPanel,
java.awt.BorderLayout.CENTER);

        // Add a button to redraw it...
        buttonPanel = new JPanel(new FlowLayout(FlowLayout.TRAILING));
        redrawButton = new JButton("Redraw");

        redrawButton.addActionListener(this);

        buttonPanel.add(redrawButton);
        getContentPane().add(buttonPanel,
java.awt.BorderLayout.SOUTH);

        pack();
    }

    /**
     * @[EMAIL PROTECTED]
 args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Java3DTest().setVisible(true);
            }
        });
    }

    public void actionPerformed(ActionEvent arg0)
	{
		redrawPanel();
	}
}


Any help is greatly appreciated.