Stage utilityStage = new Stage();
utilityStage.setTitle("Stage Utility type demo");
UndecoratorScene scene = new UndecoratorScene(utilityStage, StageStyle.UTILITY, root, null);
utilityStage.setScene(scene);
utilityStage.initModality(Modality.WINDOW_MODAL);
utilityStage.initOwner(primaryStage);
// Set sizes based on client area's sizes
Undecorator undecorator = scene.getUndecorator();
utilityStage.setMinWidth(undecorator.getMinWidth());
utilityStage.setMinHeight(undecorator.getMinHeight());