PIT : security warning window is created on the taskbar & closing it will exit jvm

I have a dialog, which has come controls. I invoke a shaped frame. Security icon can be seen on both dialog & on frame. I click on frame window which is there on the taskbar. The shaped windows gets minimized. Then i click on the desktop, so that dailog security icon can disappear. Now i move the mouse pointer on the dialog. I can see a security warning window by title 'Warning window' is created on the taskbar. I right click on the newly created warning windows & close it by selecting the menuitem 'Close'. Now the whole application exits.

I have attached the screen shot .

Step to reproduce:-
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1) Run the attached jar file.
java -jar -Djava.security.manager ToplevelFactory.jar
2) select 'frame' , Oval shape & click on 'Show toplevel' button.
3) You can see a 'Oval shaped frame'.
4) click on the frame window which is created on the taskbar.
5) Click some where on the desktop. so that security warning can disappear from the dialog.
6) Move the mouse pointer on the dialog. Observe that an extra window with title 'Warning window' is created on the window list.
7) Right click on the 'Warning window' window on the taskbar & select the close button.
Observe that application exits. If you see the same then the bug is reproduced.

I tested this on 6u12 b02 pit build , Solaris 10 & solaris 11, Gnome window manager.