Since Java8b88 resetting the Scene inside FXCanvas fails with an NPE:

java.lang.NullPointerException
at com.sun.javafx.tk.quantum.EmbeddedScene.setStage(EmbeddedScene.java:99)
at com.sun.javafx.tk.quantum.GlassStage.setScene(GlassStage.java:83)
at com.sun.javafx.tk.quantum.EmbeddedStage.setScene(EmbeddedStage.java:62)
at javafx.stage.Window$SceneModel.updatePeerStage(Window.java:509)
at javafx.stage.Window$SceneModel.invalidated(Window.java:462)
at javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:109)
at javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:143)
at javafx.stage.Window.setScene(Window.java:431)
at com.sun.javafx.stage.EmbeddedWindow.setScene(EmbeddedWindow.java:51)
at javafx.embed.swt.FXCanvas.setScene(FXCanvas.java:271)
at