Hi everybody,
I wonder if someone can help me to solve this problem then.
    1 - I'm mimicking a Keyboard (GUI application). When the Key "A" on a keyboard is pressed (for example), 
the key ("A" in this example) on the GUI application "should" light up.
    2 - The following code "should" have done so...but, I've got the first light up once, when starts the application. 
    3 - Then nothing for the following pressed keys (A to Z on the GUI).
Could someone tell me where I get it wrong, or suggest to me a simple way yet effective to do this, please?
Many thanks for your time.

...
 
/**
 *
 */
lightOn_A = new ImageIcon ( "ImagesKeys/lightOn_A.gif" );
label_A = new JLabel ( lightOn_A );
 
    if ( _keyPressed.equals ( "A" ) )
    {
        try {
            /**
             *
             */
            panel_LBD_Row2.removeAll ( );
 
            panel_LBD_Row2.add ( label_A );
            panel_LBD_Row2.add ( labelS );
            panel_LBD_Row2.add ( labelD );
            panel_LBD_Row2.add ( labelF );
            panel_LBD_Row2.add ( labelG );
            panel_LBD_Row2.add ( labelH );
            panel_LBD_Row2.add ( labelJ );
            panel_LBD_Row2.add ( labelK );
            panel_LBD_Row2.add ( labelL );
 
            panel_LBD_Row2.repaint ();
        }
        catch ( Exception ex ) { }
 
        panel_LBD_Row2.repaint ();
 
        try {
            javax.swing.SwingUtilities.invokeLater ( new Runnable ()
                {
                    public void run ()
                    {
                        panel_LBD_Row2.removeAll ( );
 
                        try {
                            Thread.sleep ( 1000 );
                        }
                        catch ( Exception ex ) { }
 
                        /**
                         *
                         */
                        panel_LBD_Row2.add ( labelA );
 
                        panel_LBD_Row2.add ( label_A );
                        panel_LBD_Row2.add ( labelS );
                        panel_LBD_Row2.add ( labelD );
                        panel_LBD_Row2.add ( labelF );
                        panel_LBD_Row2.add ( labelG );
                        panel_LBD_Row2.add ( labelH );
                        panel_LBD_Row2.add ( labelJ );
                        panel_LBD_Row2.add ( labelK );
                        panel_LBD_Row2.add ( labelL );
 
                        panel_LBD_Row2.repaint ();
                    }
                }
            );
        }
        catch ( Exception ex ) { }
    }
etc....

...
 
/**
 *
 */
lightOn_A = new ImageIcon ( "ImagesKeys/lightOn_A.gif" );
label_A = new JLabel ( lightOn_A );
 
    if ( _keyPressed.equals ( "A" ) )
    {
        try {
            /**
             *
             */
            panel_LBD_Row2.removeAll ( );
 
            panel_LBD_Row2.add ( label_A );
            panel_LBD_Row2.add ( labelS );
            panel_LBD_Row2.add ( labelD );
            panel_LBD_Row2.add ( labelF );
            panel_LBD_Row2.add ( labelG );
            panel_LBD_Row2.add ( labelH );
            panel_LBD_Row2.add ( labelJ );
            panel_LBD_Row2.add ( labelK );
            panel_LBD_Row2.add ( labelL );
 
            panel_LBD_Row2.repaint ();
        }
        catch ( Exception ex ) { }
 
        panel_LBD_Row2.repaint ();
 
        try {
javax.swing.SwingUtilities.invokeLater ( new
eLater ( new Runnable ()
                {
                    public void run ()
                    {
                        panel_LBD_Row2.removeAll ( );
 
                        try {
                            Thread.sleep ( 1000 );
                        }
                        catch ( Exception ex ) { }
 
                        /**
                         *
                         */
                        panel_LBD_Row2.add ( labelA );
 
                        panel_LBD_Row2.add ( label_A );
                        panel_LBD_Row2.add ( labelS );
                        panel_LBD_Row2.add ( labelD );
                        panel_LBD_Row2.add ( labelF );
                        panel_LBD_Row2.add ( labelG );
                        panel_LBD_Row2.add ( labelH );
                        panel_LBD_Row2.add ( labelJ );
                        panel_LBD_Row2.add ( labelK );
                        panel_LBD_Row2.add ( labelL );
 
                        panel_LBD_Row2.repaint ();
                        
                        //  try include this here
                        panel_LBD_Row2.updateUI();
                        //  I assume panel_LBD_Row2 is a
                        //  JPanel
                    }
                }
            );
        }
        catch ( Exception ex ) { }
    }