BorderPane_SharedControls1
 
 
Code:
 
/*
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package javafxtemplate1;
import java.time.LocalDate;
import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.DatePicker;
import javafx.scene.control.Label;
import javafx.scene.input.KeyEvent;
import javafx.scene.layout.Border;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Pane;
import javafx.scene.layout.Priority;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

/**
 *
 * @author Manas14
 */

public class JavaFXTemplate1 extends Application {
     @Override
    public void start(Stage primaryStage) {
        
        BorderPane bPane = new BorderPane(); 
        DatePicker datePicker = new DatePicker();
        VBox gCenter = new VBox(); 
        gCenter.setStyle("-fx-background-color: ORANGE;");
// top and bottom in bPane 
        Label lTop = new Label("TOP");
        lTop.setId("lTop");
        Label lBottom = new Label("Bottom");
        Label lLeft = new Label("Left"); 
        Label lRight = new Label("Right");
        Label lCenter = new Label("Center");
        HBox hbox1 = new HBox();HBox hbox2 = new HBox();
        VBox vbox1 = new VBox();VBox vbox2 = new VBox();
        vbox1.setStyle("-fx-background-color: YELLOW;");
        vbox2.setStyle("-fx-background-color: YELLOW;");
        //
        hbox1.setStyle("-fx-background-color: RED;");
        hbox1.getChildren().add(lTop);
        hbox1.setAlignment(Pos.CENTER);hbox1.setMinHeight(50);
        //
        hbox2.setStyle("-fx-background-color: GREEN;");
        hbox2.getChildren().add(lBottom);//Ignored
        hbox2.setAlignment(Pos.CENTER);hbox2.setMinHeight(50);
        //
        vbox1.getChildren().add(lLeft); vbox1.setAlignment(Pos.CENTER);
        vbox1.setMinWidth(50);
        vbox2.getChildren().add(lRight); vbox2.setAlignment(Pos.CENTER);
        vbox2.setMinWidth(50);
         //
        gCenter.getChildren().addAll(lCenter,lBottom,datePicker);
        bPane.setTop(hbox1); bPane.setLeft(vbox1);
        bPane.setCenter(gCenter);bPane.setRight(vbox2)  ;
        bPane.setBottom(hbox2); // Ignoerd
        //
        //
        datePicker.setOnAction(event -> {
    LocalDate date = datePicker.getValue();
    lCenter.setText("Selected date: " + date);
});
        
        
        //
        Scene scene = new Scene(bPane, 300, 300);   
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

		
 

BorderPane may have low priority on the shared UI controls. A label control "lBottom" as shown within Red rectangle below, was not loaded in HBox in the lower NODE,  but loaded with VBox ("in green rectangle") in the middle NODE.