Menu e Canvas3D

Uso o JMenu e um Canvas3D em um JFrame com BorderLayout, mas quando quero exibir as opções do menu, elas ficam atrás do Canvas3D.
Abaixo segue o codigo que foi compilado com java1.3 e java3d1.3
existe uma linha, que ta até comentada, que quando removida da pra ver os menus, mas caso contrario não da pra ver. Testem o código, por favor, e verifiquem se alguem acha a solução.

import java.awt.;
import java.awt.event.
;
import javax.swing.;
import javax.media.j3d.
;
import javax.vecmath.;
import com.sun.j3d.utils.universe.
;
import com.sun.j3d.utils.geometry.*;

public class Lab extends JFrame {
private SimpleUniverse u;
private BranchGroup b;
private Canvas3D c;
private JMenuBar jMenuBar1;
private JMenu jMenuArq;
private JMenuItem jMenuArqNovo;
private JMenuItem jMenuArqAbrir;
private JMenuItem jMenuArqSalvar;
private JSeparator jSeparator2;
private JMenuItem jMenuArqSair;
private JMenu jMenuProp;
private JMenuItem jMenuPropPc[];
private JMenu jMenuAjuda;
private JMenuItem jMenuAjudaAjuda;
private JSeparator jSeparator1;
private JMenuItem jMenuAjudaSobre;
private JPanel jPanel;

private static final Color3f FUNDO = new Color3f(0.05f, 0.09f, 0.2f);

private BranchGroup criarCena(SimpleUniverse u) {
BranchGroup b = new BranchGroup();

Transform3D roty = new Transform3D();
roty.rotY(Math.PI/3);
TransformGroup tg = new TransformGroup(roty);
tg.addChild(new ColorCube(0.2f));

b.addChild(tg);
b.compile();
return b;
}

public Lab() {
this.getContentPane().setLayout(new BorderLayout());
GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration();
c = new Canvas3D(config);
u = new SimpleUniverse©;
b = criarCena(u);
u.getViewingPlatform().setNominalViewingTransform();
u.addBranchGraph(b);

//************************************** adcionar menu ***************************************

jMenuBar1 = new JMenuBar();
jMenuArq = new JMenu(“Arquivo”);
jMenuArqNovo = new JMenuItem(“Novo”);
jMenuArq.add(jMenuArqNovo);
jMenuArqAbrir = new JMenuItem(“Abrir”);
jMenuArq.add(jMenuArqAbrir);
jMenuArqSalvar = new JMenuItem(“Salvar”);
jMenuArq.add(jMenuArqSalvar);
jSeparator1 = new JSeparator();
jMenuArq.add(jSeparator1);
jMenuArqSair = new JMenuItem(“Sair”);
jMenuArq.add(jMenuArqSair);
jMenuAjuda = new JMenu(“Ajuda”);
jMenuAjudaAjuda = new JMenuItem(“Ajuda do LVR”);
jMenuAjuda.add(jMenuAjudaAjuda);
jSeparator2 = new JSeparator();
jMenuAjuda.add(jSeparator2);
jMenuAjudaSobre = new JMenuItem(“Sobre do LVR”);
jMenuAjuda.add(jMenuAjudaSobre);
jMenuProp = new JMenu(“Propriedades”);

jMenuPropPc = new JMenuItem[15];

for (int i=0; i< jMenuPropPc.length; i++){
jMenuPropPc[i] = new JMenuItem(“PC”+(i+1));
jMenuPropPc[i].setActionCommand(“PC”+(i+1));
jMenuProp.add(jMenuPropPc[i]);
}

jMenuBar1.add(jMenuArq);
jMenuBar1.add(jMenuProp);
jMenuBar1.add(jMenuAjuda);

setJMenuBar(jMenuBar1);

this.getContentPane().add(“Center”, c); //Comentando esta linha os menus funcionam corretamente

this.setSize(800,600);
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
this.setVisible(true);

} //fim construtor

//********************************************************************************************
public static void main(String argv[]) {
Lab app = new Lab();
app.addWindowListener(new WindowAdapter() {
public void windowclosing(WindowEvent e) {
System.exit(0);
}
});
}

}

Opa, poste o código usando o botão CODE acima…

T+


import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.media.j3d.*; 
import javax.vecmath.*; 
import com.sun.j3d.utils.universe.*; 
import com.sun.j3d.utils.geometry.*; 

public class Lab extends JFrame { 
private SimpleUniverse u; 
private BranchGroup b; 
private Canvas3D c; 
private JMenuBar jMenuBar1; 
private JMenu jMenuArq; 
private JMenuItem jMenuArqNovo; 
private JMenuItem jMenuArqAbrir; 
private JMenuItem jMenuArqSalvar; 
private JSeparator jSeparator2; 
private JMenuItem jMenuArqSair; 
private JMenu jMenuProp; 
private JMenuItem jMenuPropPc[]; 
private JMenu jMenuAjuda; 
private JMenuItem jMenuAjudaAjuda; 
private JSeparator jSeparator1; 
private JMenuItem jMenuAjudaSobre; 
private JPanel jPanel; 

private static final Color3f FUNDO = new Color3f(0.05f, 0.09f, 0.2f); 

private BranchGroup criarCena(SimpleUniverse u) { 
BranchGroup b = new BranchGroup(); 

Transform3D roty = new Transform3D(); 
roty.rotY(Math.PI/3); 
TransformGroup tg = new TransformGroup(roty); 
tg.addChild(new ColorCube(0.2f)); 

b.addChild(tg); 
b.compile(); 
return b; 
} 


public Lab() { 
this.getContentPane().setLayout(new BorderLayout()); 
GraphicsConfiguration config = SimpleUniverse.getPreferredConfiguration(); 
c = new Canvas3D(config); 
u = new SimpleUniverse(c); 
b = criarCena(u); 
u.getViewingPlatform().setNominalViewingTransform(); 
u.addBranchGraph(b); 


//************************************** adcionar menu *************************************** 

jMenuBar1 = new JMenuBar(); 
jMenuArq = new JMenu("Arquivo"); 
jMenuArqNovo = new JMenuItem("Novo"); 
jMenuArq.add(jMenuArqNovo); 
jMenuArqAbrir = new JMenuItem("Abrir"); 
jMenuArq.add(jMenuArqAbrir); 
jMenuArqSalvar = new JMenuItem("Salvar"); 
jMenuArq.add(jMenuArqSalvar); 
jSeparator1 = new JSeparator(); 
jMenuArq.add(jSeparator1); 
jMenuArqSair = new JMenuItem("Sair"); 
jMenuArq.add(jMenuArqSair); 
jMenuAjuda = new JMenu("Ajuda"); 
jMenuAjudaAjuda = new JMenuItem("Ajuda do LVR"); 
jMenuAjuda.add(jMenuAjudaAjuda); 
jSeparator2 = new JSeparator(); 
jMenuAjuda.add(jSeparator2); 
jMenuAjudaSobre = new JMenuItem("Sobre do LVR"); 
jMenuAjuda.add(jMenuAjudaSobre); 
jMenuProp = new JMenu("Propriedades"); 

jMenuPropPc = new JMenuItem[15]; 

for (int i=0; i< jMenuPropPc.length; i++){ 
jMenuPropPc[i] = new JMenuItem("PC"+(i+1)); 
jMenuPropPc[i].setActionCommand("PC"+(i+1)); 
jMenuProp.add(jMenuPropPc[i]); 
} 

jMenuBar1.add(jMenuArq); 
jMenuBar1.add(jMenuProp); 
jMenuBar1.add(jMenuAjuda); 

setJMenuBar(jMenuBar1); 

this.getContentPane().add("Center", c); //Comentando esta linha os menus funcionam corretamente 

this.setSize(800,600); 
this.setDefaultCloseOperation(DISPOSE_ON_CLOSE); 
this.setVisible(true); 


} //fim construtor 


//******************************************************************************************** 
public static void main(String argv[]) { 
Lab app = new Lab(); 
app.addWindowListener(new WindowAdapter() { 
public void windowclosing(WindowEvent e) { 
System.exit(0); 
} 
}); 
} 

}