The ComboBox component selection list isn't moved with the JFrame containing the JFXPanel

If you add a JFXPanel with a ComboBox to a JFrame , when the ComboBox option list is show, you can move the JFrame and the option list keep in the same position.

If the JFrame is a JDialog when you close the JDIalog the option list is left behind

If you move mouse over the list NPE


Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
        at com.sun.javafx.tk.quantum.GlassScene.sceneChanged(GlassScene.java:269)
        at com.sun.javafx.tk.quantum.ViewScene.sceneChanged(ViewScene.java:156)
        at com.sun.javafx.tk.quantum.PopupScene.sceneChanged(PopupScene.java:30)
        at com.sun.javafx.tk.quantum.GlassScene.entireSceneNeedsRepaint(GlassScene.java:141)
        at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:444)
        at com.sun.glass.ui.View.handleViewEvent(View.java:511)
        at com.sun.glass.ui.View.handleViewEvent(View.java:808)
        at com.sun.glass.ui.View.notifyRepaint(View.java:867)
        at com.sun.glass.ui.gtk.GtkApplication._runLoop(Native Method)
        at com.sun.glass.ui.gtk.GtkApplication$3$1.run(GtkApplication.java:82)
        at java.lang.Thread.run(Thread.java:722)

There is an attached test and screen captures that show the problem

Any ideas to workaround the issue?