Getting "java.lang.NullPointerException: null pData" while opening a FileDialog/PrintDialog/PageDialog in Windows.
This is reproducible in Windows XP, Vista with the Jdk7 b55 pit build.

Steps to Reproduce:
1. Run the attached testcase(ModalityTest.java)
2. Click on "Open File Dialog", "Open Page Dialog" and "Open Print Dialog"
3.Observe that Exception is thrown on console. If you see the same, then the bug is reproduced.

The stack trace is:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: null pData
        at sun.awt.windows.WComponentPeer.setZOrder(Native Method)
        at sun.awt.windows.WComponentPeer.setZOrder(WComponentPeer.java:1032)
        at java.awt.Component.addNotify(Component.java:6669)
        at java.awt.Container.addNotify(Container.java:2611)
        at java.awt.Window.addNotify(Window.java:720)
        at java.awt.Dialog.addNotify(Dialog.java:763)
        at java.awt.FileDialog.addNotify(FileDialog.java:283)
        at java.awt.Dialog.conditionalShow(Dialog.java:912)
        at java.awt.Dialog.show(Dialog.java:1061)
        at java.awt.Component.show(Component.java:1525)
        at java.awt.Component.setVisible(Component.java:1477)
        at java.awt.Window.setVisible(Window.java:925)
        at java.awt.Dialog.setVisible(Dialog.java:1011)
        at ModalityTest.actionPerformed(ModalityTest.java:79)
        at java.awt.Button.processActionEvent(Button.java:409)
        at java.awt.Button.processEvent(Button.java:377)
        at java.awt.Component.dispatchEventImpl(Component.java:4620)
        at java.awt.Component.dispatchEvent(Component.java:4446)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:605)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThre
ad.java:286)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.
java:201)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:191)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:186)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:178)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:139)