TitledPane.collapsibleProperty() has the following syntax.
public final BooleanProperty collapsibleProperty()
In the following code shows how to use TitledPane.collapsibleProperty() method.
import javafx.application.Application; import javafx.geometry.Insets; import javafx.scene.Group; import javafx.scene.Node; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.TextField; import javafx.scene.control.TitledPane; import javafx.scene.image.Image; import javafx.scene.image.ImageView; import javafx.scene.layout.GridPane; import javafx.scene.layout.HBox; import javafx.scene.paint.Color; import javafx.stage.Stage; //from w w w . ja v a 2 s.c o m public class Main extends Application { public static void main(String[] args) { launch(args); } @Override public void start(Stage stage) { stage.setTitle("TitledPane"); Scene scene = new Scene(new Group(), 450, 250); scene.setFill(Color.GHOSTWHITE); Node rootIcon = new ImageView(new Image(getClass().getResourceAsStream("root.png"))); TitledPane gridTitlePane = new TitledPane("Title",rootIcon); GridPane grid = new GridPane(); grid.setVgap(4); grid.setPadding(new Insets(5, 5, 5, 5)); grid.add(new Label("To: "), 0, 0); grid.add(new TextField(), 1, 0); grid.add(new Label("Cc: "), 0, 1); grid.add(new TextField(), 1, 1); grid.add(new Label("Subject: "), 0, 2); grid.add(new TextField(), 1, 2); grid.add(new Label("Attachment: "), 0, 3); grid.add(new Label("static value"),1, 3); gridTitlePane.setText("Grid"); gridTitlePane.setContent(grid); System.out.println(gridTitlePane.collapsibleProperty()); HBox hbox = new HBox(10); hbox.setPadding(new Insets(20, 0, 0, 20)); hbox.getChildren().setAll(gridTitlePane); Group root = (Group)scene.getRoot(); root.getChildren().add(hbox); stage.setScene(scene); stage.show(); } } //