With SwingSet on Windows NT with JDK-1.2fcs, dismissing the Component Dialog after making some selections in the dialog causes the exceptions below.

Steps to Reproduce:
0) Launch SwingSet with one of the configurations above.
1) Select the Component Dialog from the Dialogs menu.
2) Make some changes in the dialog.
3) Hit Option 4 button.
RESULT: The following exceptions are thrown, and the integrity of the dialog the next time you bring it up might be ruined.

Exception occurred during event dispatching:
java.lang.IllegalMonitorStateException: current thread not owner
        at sun.awt.windows.WDialogPeer._show(Native Method)
        at sun.awt.windows.WDialogPeer.show(WDialogPeer.java:55)
        at java.awt.Dialog.show(Dialog.java:326)
        at com.sun.java.swing.JOptionPane.showOptionDialog(Compiled Code)
        at SwingSet$15.actionPerformed(SwingSet.java:1099)
        at com.sun.java.swing.AbstractButton.fireActionPerformed(Compiled Code)
        at com.sun.java.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1051)
        at com.sun.java.swing.DefaultButtonModel.fireActionPerformed(Compiled Code)
        at com.sun.java.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)
        at com.sun.java.swing.AbstractButton.doClick(AbstractButton.java:206)
        at com.sun.java.swing.plaf.basic.BasicMenuItemUI$MenuDragMouseHandler.menuDragMouseReleased(BasicMenuItemUI.java:717)
        at com.sun.java.swing.JMenuItem.fireMenuDragMouseReleased(Compiled Code)
        at com.sun.java.swing.JMenuItem.processMenuDragMouseEvent(Compiled Code)
        at com.sun.java.swing.JMenuItem.processMouseEvent(Compiled Code)
        at com.sun.java.swing.MenuSelectionManager.processMouseEvent(Compiled Code)
        at com.sun.java.swing.plaf.basic.BasicMenuUI$MouseInputHandler.mouseReleased(BasicMenuUI.java:245)
        at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:227)
        at java.awt.Component.processMouseEvent(Compiled Code)
        at java.awt.Component.processEvent(Compiled Code)
        at java.awt.Container.processEvent(Compiled Code)
        at java.awt.Component.dispatchEventImpl(Compiled Code)
        at java.awt.Container.dispatchEventImpl(Compiled Code)
        at java.awt.Component.dispatchEvent(Compiled Code)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Compiled Code)
        at java.awt.LightweightDispatcher.processMouseEvent(Compiled Code)
        at java.awt.LightweightDispatcher.dispatchEvent(Compiled Code)
        at java.awt.Container.dispatchEventImpl(Compiled Code)
        at java.awt.Window.dispatchEventImpl(Compiled Code)
        at java.awt.Component.dispatchEvent(Compiled Code)
        at java.awt.EventQueue.dispatchEvent(Compiled Code)
        at java.awt.EventDispatchThread.run(Compiled Code)snicker:/home/nancys%