Page: http://ipg-jets.us.oracle.com/JavaFX/id_common-files/id_common-outgoing/E17411_01/javafx/2.0/webview/jfxpub-webview.htm
When "Forums" link is clicked more then one time, the following exception is thrown:

java.lang.IllegalArgumentException: Children: duplicate children added parent=HBox@61736e[styleClass=browser-toolbar]
at javafx.scene.Parent$1.onProposedChange(Parent.java:325)
at com.sun.javafx.collections.VetoableObservableList.addAll(VetoableObservableList.java:86)
at com.sun.javafx.collections.ObservableListWrapper.addAll(ObservableListWrapper.java:103)
at com.sun.javafx.collections.ObservableListWrapper.addAll(ObservableListWrapper.java:227)
at Browser$1.handle(Main.java:97)
at Browser$1.handle(Main.java:92)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:60)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:162)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:115)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:47)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:28)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Node.fireEvent(Node.java:5882)
at javafx.scene.control.Hyperlink.fire(Hyperlink.java:118)
at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:169)
at com.sun.javafx.scene.control.skin.SkinBase$5.handle(SkinBase.java:297)
at com.sun.javafx.scene.control.skin.SkinBase$5.handle(SkinBase.java:290)
at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:56)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:162)
at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:115)
at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:38)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:37)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:35)
at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:92)
at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:47)
at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:33)
at javafx.event.Event.fireEvent(Event.java:171)
at javafx.scene.Scene$MouseHandler.process(Scene.java:2699)
at javafx.scene.Scene$MouseHandler.process(Scene.java:2520)
at javafx.scene.Scene$MouseHandler.access$1200(Scene.java:2493)
at javafx.scene.Scene.impl_processMouseEvent(Scene.java:1226)
at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:1810)
at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:200)
at com.sun.glass.ui.View.handleMouseEvent(View.java:256)
at com.sun.glass.ui.View.notifyMouse(View.java:516)
at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
at com.sun.glass.ui.win.WinApplication.access$100(WinApplication.java:29)
at com.sun.glass.ui.win.WinApplication$2$1.run(WinApplication.java:62)
at java.lang.Thread.run(Thread.java:662)