JComboBox setSelectedIndex(tal) Problem

Kan man ikke sætte et JComboBox index inde i en metode som i følgende lille program eks.
....

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TypeTest
{  public static void main(String[] args)
  {  MyFrame frame = new MyFrame();
      frame.setTitle(\"TypeTest\");
      frame.show();
  }               
}               

class MyFrame extends JFrame
{
    private JButton trykButton = new JButton(\"Tryk mig\");
    private JComboBox typecombo;
    private Object[] typer = {    \"Type1\", \"Type2\", \"Type3\"    };

    public MyFrame()
  {    final int DEFAULT_FRAME_HEIGHT = 480;
        final int DEFAULT_FRAME_WIDTH = 640;
        setSize(DEFAULT_FRAME_WIDTH, DEFAULT_FRAME_HEIGHT);
    addWindowListener(new WindowCloser() );
    trykButton.addActionListener(new ButtonListener());
        JComboBox typecombo = new JComboBox(typer);
        JPanel typePanel = new JPanel();
        typePanel.add(typecombo);
        JPanel typeComboPanel = new JPanel();
    typeComboPanel.setLayout(new GridLayout(1, 3) );
        typeComboPanel.add(new JLabel(\"Vælg type : \", 4) );
        typeComboPanel.add(typePanel);
        typeComboPanel.add(trykButton);
       
        Container flade = getContentPane();
        flade.add(typeComboPanel, \"North\");
    }   
    //--------------------------------------------------ButtonListener
  private class ButtonListener implements ActionListener
  { public void actionPerformed(ActionEvent event)
    {    // når man trykker vil jeg gerne have at
            // combo boxen skifter til index 2 altså \"type3\"
            System.out.println(\"hej\");
            typecombo.setSelectedIndex(2);
        }                                                               
  }
    private class WindowCloser extends WindowAdapter
    { public void windowClosing(WindowEvent event)
      {  System.exit(0);
      }   
    }
}