Set the Cursor for Anactive Frames

Hi,
my Application got a Main Frame (JFrame).
Sometimes i open up a Dialog. While the Dialog is open i would like to have a
"Wait-Cursor" for the inactive Frame. (Dialogs parent is the Frame).
Is there a way to do that.
Anyone can help?
My litte example doesn't work.

package framecursor;

import java.awt.Cursor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class FrameCursorMain extends JFrame
{
JPanel mainPanel = new JPanel() ;
JButton openButton = new JButton("Open") ;
public static void main(String[] args)
{
new FrameCursorMain() ;
}
public FrameCursorMain()
{
this.setContentPane(mainPanel) ;
mainPanel.add(openButton) ;
openButton.addActionListener( new DialogListener(this)) ;
this.setSize(300,200) ;
// Show The Frame
this.setVisible(true) ;
}

}
class DialogListener implements ActionListener
{
JFrame parentFrame = null ;
public DialogListener(JFrame parentFrame)
{
super();
this.parentFrame = parentFrame;
}
public void actionPerformed(ActionEvent e)
{
// Define the Dialog
JDialog dlg = new JDialog( parentFrame, "TestDialog", true) ;
dlg.setSize(200,100) ;
// Set the Cursor of the Frame and open the Dialog
parentFrame.setCursor( Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR) ) ;
dlg.setVisible(true) ;
// DLG was closed
// Reset the Cursor of the Frame
parentFrame.setCursor( Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR)) ;
}
}
.

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