Can't dispose my dialog after moving it using swing timer

[eranga262154]

Hi all,

I use the swing timer to move a dialog from one position to another. Here is the code I have use.

// Set the main window display location
    public void setWindowLocation()
    {
        int screenHeight = Toolkit.getDefaultToolkit().getScreenSize().height;
        int screenWidth = Toolkit.getDefaultToolkit().getScreenSize().width;
        
        int frameHeight = this.getHeight();
        int frameWidth = this.getWidth();
                
        int _xValue = (screenWidth - frameWidth);
        int _yValue = (screenHeight - getTrayheight() );
        int _yEnd = (screenHeight - frameHeight - getTrayheight() );
        
        //this.setLocation((screenWidth - frameWidth), (screenHeight - frameHeight - getTrayheight() - WINDOW_SPACE));
        this.setLocation(_xValue, _yValue);
        
        while(_yValue > _yEnd){
            dialogMotion(this, _xValue, _yValue);
            _yValue -= 1;
        }
 
        // this.dispose();
    }
    
// Dialog motion
    private void dialogMotion(final MainDialog mainDialog, final int x, final int y){
        AbstractAction abAction = new AbstractAction() {
            public void actionPerformed(ActionEvent evnt) {
                mainDialog.setLocation(x, y);
            }
        };
        Timer motionTimer = new Timer(300, abAction);
        motionTimer.setRepeats(false);
        motionTimer.start();
    }
    
// Find the taskbar height to place the main frame in lower-right corner
// of the viewable area of the screen.
    private static int getTrayheight(){
        return (Toolkit.getDefaultToolkit().getScreenSize().height -
                 GraphicsEnvironment.getLocalGraphicsEnvironment().getMaximumWindowBounds().height);
    }

I think my code is clear to you. After moving the dialog onto the task bar, I want to dispose it. You can see that at the end of the while loop I've try it.

What happened there is, I can't see the dialog moving. it directly dispose. I add a breakpoint at the while loop and check, it iterate until condition is false. But I can't see the motion. If I comment the dispose code line as in my above code, I can see it moving.

Why is that. Your comment really helpful to me.

I'm worried is that debugging iterate that while loop but it is not visible.