This program first registeres itself as an AWTEventListener and starts
another Java program (e.g. SwingSet2 demo) passed as a command line
argument. It then displays message as new windows are opened/closed. It
also display the name of the menu item and it's ancestor window when
user clicks on a menu item.

The following procedure will help us notice this behaviour:

a) Compile and run this program with the standard
  "SwingSet2 demo as follows:

c:\>java -classpath ".;%JAVA_HOME%\demo\jfc\SwingSet2\swingSet2.jar"
    DumpWindow SwingSet2

b) Click on "Themes" (Do not select any of the selection just yet).

   You will see that the program print "Menu: JMenu" and "Window:
   JFrame".

c) Select any one of the themes, say Aqua.

   The program will print "Menu:JRadioButtonMenuItem" and "Window:
   JFrame".

d) Now select "File --> About" and click "OK"

e) Go back to Themes (again do not select any option, just click and
   hold the mouse on "Themes")

   The program will print "Menu: JMenu" and "Window: JFrame"

   **Interestingly** this time, we will see the following event:

********

java.awt.event.WindowEvent[WINDOW_OPENED,opposite=null,oldState=0,newState=0] on
 ###overrideRedirect###
   javax.swing.Popup$HeavyWeightWindow[###overrideRedirect###,213,104,117x152,la
yout=java.awt.BorderLayout,rootPaneCheckingEnabled=true]

******

which we did NOT see earlier at step b.

f) Now select any theme, say "Default", now, you will see the program
   will print "Menu: JRadioButtonMenuItem" and "Window:
   Popup$HeavyWeightWindow"

*NOTE* At step f), the ancestor for "JRadioButtonMenuItem" has CHANGED
from "JFrame" in step c) to "Popup$HeavyWeightWindow" is step f).

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