Moving objects on GlassPane ignores setLocation()

For a current project of mine I have to move some Labels around on the
GlassPane. For this, I am first putting the objects on the pane and
then move them to the right location using setLocation(). But the
setLocation() command is always ignored at first, until the next
MouseMotionEvent is intercepted.

Below is some sample code replicating the problem. Move the mouse in
the program window. Then use the mouse button, but don't move the
mouse. You will see the picture enter the window at the top, centered
vertically, even though the program sets the location to that of the
mouse cursor. If you now move the mouse, the program behaves correctly
again.

Do you have any idea how to correct this?

import java.awt.AWTEvent;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

@SuppressWarnings("serial")
public class PickUpAndDrop2 extends JFrame{

    // Use Singleton design pattern to provide easy access of the
relevant object
    // to the listeners
    private static PickUpAndDrop2 instance = new PickUpAndDrop2();

    // The label to be moved around
    JLabel label;

    private PickUpAndDrop2(){
        this.setSize(200, 200);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        // Create a JLabel to be moved around on the GlassPane
        java.net.URL url = this.getClass().getResource("image.png");
        ImageIcon image = new ImageIcon(url);
        this.label = new JLabel(image);

        // Register a listener to the label to be picked up on click
        this.label.addMouseListener(this.createListener());

        // Get the GlassPane and prepare it for display
        JPanel glasspane = (JPanel)this.getGlassPane();
        glasspane.setOpaque(false);

        // Put the label on the window
        this.add(this.label);
    }

    // Puts the label on the GlassPane
    protected void pickUp(){
        // Create a new GlassPane
        JPanel glasspane = new JPanel();
        this.setGlassPane(glasspane);
        glasspane.setVisible(true);
        glasspane.setOpaque(false);

        // Register GlassPane as an "indirect" listener to MouseMotionEvents

Toolkit.getDefaultToolkit().addAWTEventListener(this.createAWTEventListener(),
                AWTEvent.MOUSE_MOTION_EVENT_MASK |
AWTEvent.MOUSE_EVENT_MASK);

        // Put the label on the GlassPane
        glasspane.add(this.label);

        // Put the label on the current location of the mouse cursor
        Point position = this.getMousePosition();
        this.moveLabel(position);
    }

    // Move the label around
    protected void moveLabel(Point position){
        this.label.setLocation(position);
    }

    // Create a listener for putting the component the click occured on
on the GlassPane
    private MouseAdapter createListener(){

        MouseAdapter listener = new MouseAdapter(){

            public void mouseClicked(MouseEvent event) {
                PickUpAndDrop2.instance.pickUp();
            }
        };

        return listener;
    }

    // Intercepts Events and checks whether or not there are events of
interest for the GlassPane
    // without actually being a listener
    private AWTEventListener createAWTEventListener(){
        AWTEventListener listener = new AWTEventListener(){

            @Override
            public void eventDispatched(AWTEvent event) {

                if (event instanceof MouseEvent) {
                    MouseEvent me = (MouseEvent) event;

                    // In case of a MouseEvent, move the object that's currently on
the GlassPane
                    // to the location of the event
                    Point point;
                    if (me.getID() == MouseEvent.MOUSE_EXITED &&
me.getComponent() == PickUpAndDrop2.instance) {
                        point = null;
                    } else {
                        MouseEvent converted =
SwingUtilities.convertMouseEvent(me.getComponent(), me,
PickUpAndDrop2.instance.getGlassPane());
                        point = converted.getPoint();
                    }
                    PickUpAndDrop2.instance.moveLabel(point);
                }

            }

        };

        return listener;
    }

    public static void main(String[] args){
        PickUpAndDrop2 frame = PickUpAndDrop2.instance;
        frame.setVisible(true);
    }
}

P.s.: This is working on the results of an earlier message (see
http://groups.google.com/group/comp.lang.java.programmer/browse_thread/thread/15f94143527b7745#),
but as it's a different problem, I am sending this as a separate
message. I hope this is okay.