I’m trying to retrieve the widthProperty of my parent column to assign it to my label but I can’t.

Without Split Column is ok

And with Split column widthProperty not working

I manage to recover those of the others simple column. In this exemple I want to get Name column Parent widthProperty.

Main code

package test;
    
    import java.io.IOException;
    import javafx.application.Application;
    import javafx.fxml.FXMLLoader;
    import javafx.scene.Parent;
    import javafx.scene.Scene;
    import javafx.stage.Stage;

    public class Test extends Application {
        
        @Override
        public void start(Stage primaryStage) throws IOException {
            Parent root = FXMLLoader.load(getClass().getResource("main.fxml"));                
            
            Scene scene = new Scene(root, 300, 250);
            
            primaryStage.setTitle("Hello World!");
            primaryStage.setScene(scene);
            primaryStage.show();
        }

        public static void main(String[] args) {
            launch(args);
        }
        
    }

FXML Code

<?xml version="1.0" encoding="UTF-8"?>
    
    <?import javafx.scene.control.ScrollPane?>
    <?import javafx.scene.control.TableColumn?>
    <?import javafx.scene.control.TableView?>
    <?import javafx.scene.control.TextArea?>
    <?import javafx.scene.layout.HBox?>
    <?import javafx.scene.layout.VBox?>
    
    <ScrollPane fitToHeight="true" fitToWidth="true" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="400.0" prefWidth="600.0" xmlns="http://javafx.com/javafx/22" xmlns:fx="http://javafx.com/fxml/1" fx:controller="test.MainController">
       <content>
          <VBox prefHeight="398.0" prefWidth="598.0">
             <children>
                <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0">
                   <children>
                      <TextArea fx:id="lb_Paper" prefHeight="200.0" promptText="Paper" wrapText="true" />
                      <TextArea fx:id="lb_PC" prefHeight="200.0" promptText="PC" wrapText="true" />
                      <TextArea fx:id="lb_Name" prefHeight="200.0" promptText="Complete Name" wrapText="true" />
                      <TextArea fx:id="lb_Movies" prefHeight="200.0" promptText="Movies" wrapText="true" />
                   </children>
                </HBox>
                <HBox alignment="CENTER" prefHeight="100.0" prefWidth="200.0" VBox.vgrow="ALWAYS">
                   <children>
                      <TableView fx:id="tb_test" prefHeight="200.0" prefWidth="200.0" HBox.hgrow="ALWAYS">
                        <columns>
                          <TableColumn fx:id="column_Paper" prefWidth="75.0" text="Paper" />
                          <TableColumn fx:id="column_PC" prefWidth="75.0" text="PC" />
                            <TableColumn fx:id="column_Name" prefWidth="75.0" text="Name" />
                            <TableColumn fx:id="column_Movies" prefWidth="75.0" text="Movies" />
                        </columns>
                         <columnResizePolicy>
                            <TableView fx:constant="CONSTRAINED_RESIZE_POLICY" />
                         </columnResizePolicy>
                      </TableView>
                   </children>
                </HBox>
             </children>
          </VBox>
       </content>
    </ScrollPane>

FXMLController Code

package test;
    
    import java.net.URL;
    import java.util.ResourceBundle;
    import javafx.fxml.FXML;
    import javafx.fxml.Initializable;
    import javafx.scene.control.Label;
    import javafx.scene.control.TableColumn;
    import javafx.scene.control.TableView;
    import javafx.scene.control.TextArea;
       
    public class MainController implements Initializable {
    
        @FXML
        private TextArea lb_Paper;
        @FXML
        private TextArea lb_PC;
        @FXML
        private TextArea lb_Name;
        @FXML
        private TextArea lb_Movies;
        @FXML
        private TableView<?> tb_test;
        @FXML
        private TableColumn<?, ?> column_Paper;
        @FXML
        private TableColumn<?, ?> column_PC;
        @FXML
        private TableColumn<?, ?> column_Name;
        @FXML
        private TableColumn<?, ?> column_Movies;
    
        @Override
        public void initialize(URL url, ResourceBundle rb) {
            
                TableColumn firstactivitePedaCol = new TableColumn("First Name");
                TableColumn secondactivitePedaCol = new TableColumn("Last Name");
                column_Name.getColumns().addAll(firstactivitePedaCol, secondactivitePedaCol);
                
                tb_test.setPlaceholder(new Label("Contexte"));
                
                lb_Paper.prefWidthProperty().bind(column_Paper.widthProperty());
                lb_Paper.minWidthProperty().bind(column_Paper.widthProperty());
                lb_Paper.maxWidthProperty().bind(column_Paper.widthProperty());
                
                lb_PC.prefWidthProperty().bind(column_PC.widthProperty());
                lb_PC.minWidthProperty().bind(column_PC.widthProperty());
                lb_PC.maxWidthProperty().bind(column_PC.widthProperty());
                
                lb_Name.prefWidthProperty().bind(column_Name.widthProperty());
                lb_Name.minWidthProperty().bind(column_Name.widthProperty());
                lb_Name.maxWidthProperty().bind(column_Name.widthProperty());
                
                lb_Movies.prefWidthProperty().bind(column_Movies.widthProperty());
                lb_Movies.minWidthProperty().bind(column_Movies.widthProperty());
                lb_Movies.maxWidthProperty().bind(column_Movies.widthProperty());
        }    
        
    }

Thx in advance for your reply