JButton does not work with setAccessibleName and NVDA

Question

I am using the following code and would like to hear NVDA and JAWS announce my button when I roll over it. The JFrame name and title bar components are announced, but that is all. Can someone help?

import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JFrame;
//import javax.accessibility.*;

public class JFrameExample
        extends JPanel {

    public JFrameExample() {
        JButton aButton = new JButton("Button");
        aButton.getAccessibleContext().setAccessibleName("Button");
        String desc = "This is a simple button";
        aButton.getAccessibleContext().setAccessibleDescription(desc);
        add(aButton);
    }

    public static void main(String[] args) {
        JFrame f = new JFrame("Accessible Button");
        f.getContentPane().add(new JFrameExample(), BorderLayout.CENTER);
        f.pack();
        f.setVisible(true);
    }
}

Environment - Windows Vista 64
JDK 1.6.0_21 32 bit , jre6 32 bit - Java Access Bridge dlls installed in both places
NetBeans 6.9.1 , Eclipse Helios 32 bit
NVDA 2010.1, JAWS 11