Createing ContextMenu outside of FX thread

[Werner Lehmann]

Hi,

I just noticed that I cannot create a ContextMenu in the Swing EDT. The 
following fails in the build method:

     ContextMenu cm = ContextMenuBuilder.create()
         .items(
             new MenuItem("item"))
         .build();

I was under the impression that adding to a scene graph must be done in 
the FX thread but I am not doing that here. Although the trace says 
different:

> Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Not on FX application thread; currentThread = AWT-EventQueue-0
> 	at com.sun.javafx.tk.Toolkit.checkFxUserThread(Toolkit.java:235)
> 	at com.sun.javafx.tk.quantum.QuantumToolkit.checkFxUserThread(QuantumToolkit.java:393)
> 	at javafx.scene.Scene.<init>(Scene.java:265)
> 	at javafx.scene.Scene.<init>(Scene.java:177)
> 	at javafx.stage.PopupWindow.<init>(PopupWindow.java:102)
> 	at javafx.scene.control.PopupControl.<init>(PopupControl.java:101)
> 	at javafx.scene.control.ContextMenu.<init>(ContextMenu.java:129)
> 	at javafx.scene.control.ContextMenuBuilder.build(ContextMenuBuilder.java:75)

So, I expected that setting the contextmenu on a button or something 
which was already part of a scene would require the FX thread context - 
but not building it. Is ContextMenu special because it is a PopupWindow 
and not a Node, or is this a misconception on my part?

Werner