MouseListener in Java 3D

Question

I am having problems getting a mouse click registered in a Java 3D environment. Basically I have a canvas3D object, onto which I have created a 3D graph and have populated it with points (plotted in 3D space). I really need to be able to click on these points and bring up some information on them. I have included what I hope is the relative parts of code... Any help would be greatly appreciated.
1st bit of code is from the applet class, Grid3D.
2nd bit is the first part of the Protein.java class. The MouseListener part of Protein.java has been implemented just to print to the cmd line "Clicked". However, it doesn't work.
          System.out.println("Displaying Points...");
          ProteinList theList = new ProteinList(459);
          theList.readProteins();
          Transform3D translate = new Transform3D();
          for (int i = 0;i<459;i++){
               Protein theProt = theList.getProteinByNum(i);
               //c.addMouseListener(theProt);     
               translate.setTranslation(new Vector3f
                    ((((theProt.getTheX()-0.5f)*2.0f)),
                    (((theProt.getTheY())-0.5f)*2.0f),
                    (((theProt.getTheZ())-0.5f)*2.0f)));
               theProt.setTransform(translate);
                                                                                theGroup.addChild(theProt);
               u.addBranchGraph(theGroup);
public class Protein extends TransformGroup implements MouseListener, Serializable
     private float x;
     private float y;
     private float z;
     private int clicked = 0;
     private Sphere thePoint;
     /** Creates a new instance of Protein
     * Super refers to TransformGroup
     * Creates Sphere with radius and appearance */
     public Protein() {
          super();
          Appearance app = new Appearance();
          Material mat =new Material();
          mat.setDiffuseColor(1.0f,0.0f,0.0f);
          app.setMaterial(mat);          
          thePoint = new Sphere(0.007f,app);
          this.addChild(thePoint);
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Answer 1

Look into behavior packages
com.sun.j3d.utils.behaviors.mouse
com.sun.j3d.utils.behaviors.picking
Also some of the pick examples in the Java3D Example Programs show how to apply these.