public HiddenSplitPaneSample() { String hidingSplitPaneCss = HiddenSplitPaneSample.class.getResource("HiddenSplitPane.css").toExternalForm(); final SplitPane splitPane = SplitPaneBuilder.create().id("hiddenSplitter").items( RegionBuilder.create().styleClass("rounded").build(), RegionBuilder.create().styleClass("rounded").build(), RegionBuilder.create().styleClass("rounded").build()).dividerPositions(new double[]{0.33, 0.66}).build(); splitPane.getStylesheets().add(hidingSplitPaneCss); getChildren().add(splitPane); }