JComboBox popup list remains open after losing keyboard focus

Question

Hi,
I have noticed a strange JComboBox behavior. When you click on the drop down arrow to show the popup list, and then press the Tab key, the keyboard focus moves to the next focusable component, but the popup list remains visible.
I have included a program that demonstrates the behavior. Run the program, click the drop down arrow, then press the Tab key. The cursor will move into the JTextField but the combo box's popup list is still visible.
Does anyone know how I can change this???
Thanks for any help or ideas.
--Yeath
import java.awt.*;
import javax.swing.*;
import java.util.*;
public class Test extends JFrame
   public Test()
      super( "Test Application" );
      this.getContentPane().setLayout( new BorderLayout() );
      Box box = Box.createHorizontalBox();
      this.getContentPane().add( box, BorderLayout.CENTER );
      Vector<String> vector = new Vector<String>();
      vector.add( "Item" );
      vector.add( "Another Item" );
      vector.add( "Yet Another Item" );
      JComboBox jcb = new JComboBox( vector );
      jcb.setEditable( true );
      JTextField jtf = new JTextField( 10 );
      box.add( jcb );
      box.add( jtf );
   public static void main( String[] args )
      Test test = new Test();
      test.pack();
      test.setVisible( true );
      test.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
}

Answer 1

ran your code on 1.5.0_3, observed problem as stated.
even though the cursor is merrily blinking in the textfield, you have to click into
the textfield to dispose the dropdown
ran your code on 1.4.2_08, no problems at all - tabbing into textfield immediately
disposed the dropdown
another example of 'usual' behaviour (involving focus) breaking between 1.4 and 1.5
the problem is that any workaround now, may itself be broken in future versions