In JavaFX 2 you can use a ProgressInidicator to show that some background task is in progress.
I would like to show ProgressIndicator centered on top of a GridPane, so that it overlays the GridPane. In Swing you can use GlassPane for this. How do I do it in JavaFX 2?
You can use StackPane. For info about layouts see Built-in Layout Panes.