[java]JRadioButton transparent ,mais mauvaise apparence!!

Bonjour a tous;
j'utilise un JPanel transparent contenant des JRadioButton transparents avec

Bouton.setOpaque(true);
Bouton.setBackGround(new Color(0,0,0,0));
mais lorsque je fait passer le curseur par le bouton ce dernier change d'apparence

que dois-je faire svp??
merci d'avance

desolé je suis débutante en java
c'est quoi "redéfinir les méthodes paint() de tes widgets."

en plus j'ai pas utilisé des methodes "paint"
le probleme reste avec le JRadioButton et les Checkbox

voilà un exemple qui ressemble un peut a mon probleme:
juste pour montrer comment les JRadioButton changent




import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


/*
* RadioButtonDemo.java requires these files:
* images/Bird.gif
* images/Cat.gif
* images/Dog.gif
* images/Rabbit.gif
* images/Pig.gif
*/
public class RadioButtonDemo extends JPanel implements ActionListener {
static String birdString = "Bird";
static String catString = "Cat";
static String dogString = "Dog";
static String rabbitString = "Rabbit";
static String pigString = "Pig";

JLabel picture;

public RadioButtonDemo() {
super(new BorderLayout());

//Create the radio buttons.
JRadioButton birdButton = new JRadioButton(birdString);
birdButton.setMnemonic(KeyEvent.VK_B);
birdButton.setActionCommand(birdString);
birdButton.setSelected(true);
birdButton.setBackground(new Color(0,0,0,0));

JRadioButton catButton = new JRadioButton(catString);
catButton.setMnemonic(KeyEvent.VK_C);
catButton.setActionCommand(catString);

JRadioButton dogButton = new JRadioButton(dogString);
dogButton.setMnemonic(KeyEvent.VK_D);
dogButton.setActionCommand(dogString);
dogButton.setBackground(new Color(0,0,0,0));

JRadioButton rabbitButton = new JRadioButton(rabbitString);
rabbitButton.setMnemonic(KeyEvent.VK_R);
rabbitButton.setActionCommand(rabbitString);

Checkbox pigButton = new Checkbox(pigString);
pigButton.setBackground(new Color(0,0,0,0));

//Group the radio buttons.
ButtonGroup group = new ButtonGroup();
group.add(birdButton);
group.add(catButton);
group.add(dogButton);
group.add(rabbitButton);
//group.add(pigButton);

//Register a listener for the radio buttons.
birdButton.addActionListener(this);
catButton.addActionListener(this);
dogButton.addActionListener(this);
rabbitButton.addActionListener(this);
// pigButton.addActionListener(this);

//Set up the picture label.
picture = new JLabel(createImageIcon(birdString+ ".gif" ));

//The preferred size is hard-coded to be the width of the
//widest image and the height of the tallest image.
//A real program would compute this.
picture.setPreferredSize(new Dimension(177, 122));


//Put the radio buttons in a column in a panel.
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(birdButton);
radioPanel.add(catButton);
radioPanel.add(dogButton);
radioPanel.add(rabbitButton);
radioPanel.add(pigButton);
radioPanel.setBackground(Color.CYAN);

add(radioPanel, BorderLayout.LINE_START);
add(picture, BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20,20,20,20));
}

/** Listens to the radio buttons. */
public void actionPerformed(ActionEvent e) {
picture.setIcon(createImageIcon(e.getActionCommand()+ ".gif" ));
}

/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = RadioButtonDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn't find file: " + path);
return null;
}
}
private static void createAndShowGUI() {
//Create and set up the window.
JFrame frame = new JFrame("RadioButtonDemo" );
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

//Create and set up the content pane.
JComponent newContentPane = new RadioButtonDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);

//Display the window.
frame.pack();
frame.setVisible(true);
}

public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application's GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
merci