Freezing Swing GUI...

Hi!
I am having problems with my swing GUI. It's freezing when I'm trying to disable a JButton in it. Could anybody tell me y it happens and what can be done to remedy it?
My piece of code:
stopButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// stop!
simulator.blinker = null;
label.setText("Stopped!");
playPauseButton.setEnabled(false);
stepButton.setEnabled(false);
showNamesButton.setEnabled(false);
speedUpButton.setEnabled(false);
speedDownButton.setEnabled(false);
stopButton.setEnabled(false);
When I press the stopButton, my GUI freezes. Same happens with this piece of code when simSpeed = 50:
speedUpButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (simulator.simSpeed > 300 && simulator.simSpeed <= 500){
simulator.simSpeed -= 100;
System.out.println("sim speed = " + simulator.simSpeed);
else if (simulator.simSpeed > 50 && simulator.simSpeed <= 300){
simulator.simSpeed -= 50;
System.out.println("sim speed = " + simulator.simSpeed);
else {//if (simulator.simSpeed == 50){
System.out.println("caution: sim speed = " + simulator.simSpeed);
speedUpButton.setEnabled(false);
Strangely, this one does not make the GUI freeze when simSpeed = 1500:
speedDownButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (simulator.simSpeed < 1500){
simulator.simSpeed += 100;
System.out.println("sim speed = " + simulator.simSpeed);
else if (simulator.simSpeed == 1500)
speedDownButton.setEnabled(false);
I'd greatly apreciate any help!
Thx in advance!
Owrwe

I have gone thru some experimentations and come to this conclusion:
when i try to disable buttons at the extremity of a row of buttons, the GUI freezes!
for example:
buttonPanel.add(speedUpButton);
buttonPanel.add(speedDownButton);
buttonPanel.add(playPauseButton);
buttonPanel.add(stepButton);
buttonPanel.add(showNamesButton);
buttonPanel.add(stopButton);
this is the order of buttons in a layout (flow layout by default, isn't it?). The GUI freezes when I try to disable: speedUpButton and stopButton (from inside their ActionListener method).
Changing the layout to:
buttonPanel.add(speedDownButton);
buttonPanel.add(speedUpButton);
buttonPanel.add(playPauseButton);
buttonPanel.add(stepButton);
buttonPanel.add(showNamesButton);
buttonPanel.add(stopButton);
The GUI freezes when I try to disable: speedDownButton (as compared to speedUpButton from above) and stopButton (from inside their ActionListener method).
Changing the layout to:
buttonPanel.add(playPauseButton);
buttonPanel.add(speedDownButton);
buttonPanel.add(speedUpButton);
buttonPanel.add(stepButton);
buttonPanel.add(stopButton);
buttonPanel.add(showNamesButton);
The GUI freezes when I try to disable: all of them (from inside the stopButton ActionListener). The speedUpButton and speedDownButton are properly disabled when the limits are reached without freezing the GUI. If I disable all buttons (thru the stopButton when it's not at the extremity of the row) except one of them, the GUI doesn't freeze!
any suggestions?

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