The is reproducible on AWT PIT build for mustang b38, only on Windows platform.

java version "1.6.0-awt.pit-int-jcg-win-03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-awt.pit-int-jcg-win-03-java2d_06_may_2005_09_06-b00)
Java HotSpot(TM) Client VM (build 1.6.0-ea-b35, mixed mode)

I've a Frame which has a button in it. On clicking the button, a dialog, with the frame as parent, is displayed. The dialog has a button in it. When the button is clicked, another dialog with the same frame as parent is displayed. This dialog has a button, which when clicked opens a window, having the dialog as parent. Mouse events are blocked on this window.

The testcase is taken from the description of the bug 4957639

To reproduce:
1. Run the attached testcase on Windows
1. You will see the Frame named "main frame" with the "open first dialog" button. Press this button
2. The "first dialog" will appear with the two buttons: "open second dialog" and "Close". Press the "open second dialog" button
3. The "second dialog" will appear with the two buttons: "open window" and "Close this dialog". Press the "open window" button
4. The undecorated window with the large button "Close" will appear.

If the close button cannot be clicked, bug is reproduced.
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