FULL PRODUCT VERSION :
java version "1.5.0_06"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_06-b05)
Java HotSpot(TM) Client VM (build 1.5.0_06-b05, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

A DESCRIPTION OF THE PROBLEM :
The editable JComboBox doesn't handles focus listeners.
If we make that as non-editable, it is handling focus listeners.

Here is my code
[code]
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;

import javax.swing.ComboBoxEditor;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;

public class TestCombo extends JFrame
{
  JComboBox cmb;
  
  public TestCombo()
  {
    cmb = new JComboBox(new String[]{"Camera1", "Camera2", "Camera3", "Camera4"});
    
    setLayout(new GridBagLayout());
    add(cmb);
    add(new JButton("Test"));
    
    cmb.setEditable(true);
    
    cmb.getEditor().addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent e)
      {
        System.out.println(cmb.getSelectedItem() + " " + cmb.getSelectedIndex());
        System.out.println(cmb.getEditor().getItem());
      }
    });
    
    cmb.addFocusListener(new FocusListener(){
      public void focusLost(FocusEvent e)
      {
        System.out.println("Focus lost");
      }

      public void focusGained(FocusEvent e)
      {
        System.out.println("Focus gained");
      }
    });
    
    setTitle("Test Combo");
    setSize(300, 300);
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    setVisible(true);
  }
  
  public static void main(String[] args)
  {
    new TestCombo();
  }
}
[/code]


REPRODUCIBILITY :
This bug can be reproduced always.
I wrote more friendly test version:

--- Source begin ---
import java.awt.GridBagLayout;
import java.awt.event.*;
import javax.swing.*;

public class Test extends JFrame {
    JComboBox cmb;
    JButton btn;

    public static void main(String[] args) throws Exception {
        SwingUtilities.invokeAndWait(new Runnable() {
            public void run() {
                new Test();
            }
        });
    }

    public Test() {
        cmb = new JComboBox(new String[]{"one", "two"});
        btn = new JButton();
        toggleEditable();
        
        getContentPane().setLayout(new GridBagLayout());
        getContentPane().add(cmb);
        getContentPane().add(btn);

        cmb.addFocusListener(new FocusListener() {
            public void focusLost(FocusEvent e) {
                System.out.println("Focus lost");
            }

            public void focusGained(FocusEvent e) {
                System.out.println("Focus gained");
            }
        });

        btn.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                toggleEditable();
            }
        });

        setTitle("Test focus listener for Combo");
        setSize(300, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    private void toggleEditable() {
        if (cmb.isEditable()) {
            cmb.setEditable(false);
            System.out.println("Combo box is uneditable");
            btn.setText("Make editable");
        } else {
            cmb.setEditable(true);
            System.out.println("Combo box is editable");
            btn.setText("Make uneditable");
        }
    }
}
--- Source end ---

Test strategy:
- Try change focus owner by the TAB key pressing
- Try change the Combo editable feature by pressing the Button
- See that editable combo doesn't get focusGained and focusLost events