jComboBox não abre - URGENTE!

/*
 * teste88.java
 *
 * Created on 29 de Setembro de 2003, 11:32
 */

/**
 *
 * @author  Renato Vertuam
 */

public class teste88 extends javax.swing.JInternalFrame {
    
    /** Creates new form teste88 */
    public teste88() {
        initComponents();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    private void initComponents() {
        jDesktopPane1 = new javax.swing.JDesktopPane();
        jComboBox1 = new javax.swing.JComboBox();

        setClosable(true);
        jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "1", "2", "3" }));
        jComboBox1.setBounds(110, 30, 150, 24);
        jDesktopPane1.add(jComboBox1, javax.swing.JLayeredPane.DEFAULT_LAYER);

        getContentPane().add(jDesktopPane1, java.awt.BorderLayout.CENTER);

        setBounds(10, 10, 400, 300);
    }
    
    
    // Variables declaration - do not modify
    private javax.swing.JComboBox jComboBox1;
    private javax.swing.JDesktopPane jDesktopPane1;
    // End of variables declaration
    
}