Reinitialiser Jcombo box

Ceci fonctionne :
Code:
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import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Vector;
 
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JPanel;
 
 
public class Combo extends JFrame {
 
    private JPanel panel = new JPanel();
 
    private JComboBox combo;
 
    private JButton button = new JButton("Sel");
 
    private Vector vect = new Vector();
 
    public Combo() {
 
        vect.add("el1");
        vect.add("el2");
        vect.add("el3");
 
        button.addActionListener(new ActionListener() {
 
            public void actionPerformed(ActionEvent event) {
                System.err.println("Sel " + (String) combo.getSelectedItem());
                combo.setSelectedIndex(0);
                System.err.println("Sel " + (String) combo.getSelectedItem());
            }
        });
        combo = new JComboBox(vect);
        panel.add(combo);
        panel.add(button);
 
        this.getContentPane().add(panel);
        this.setSize(200, 300);
        this.setVisible(true);
    }
}