http://stackoverflow.com/questions/29623849/how-can-i-multiple-duplicate-a-splitpane-including-childrens-with-javafx

Controller.java

package sample;

import javafx.collections.FXCollections;
import javafx.collections.ListChangeListener;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.chart.CategoryAxis;
import javafx.scene.chart.NumberAxis;
import javafx.scene.chart.StackedBarChart;
import javafx.scene.chart.XYChart;
import javafx.scene.control.ScrollPane;
import javafx.scene.control.SplitPane;
import javafx.scene.control.TableView;
import javafx.scene.layout.AnchorPane;

import java.net.URL;
import java.util.ResourceBundle;

public class Controller implements Initializable{

    @FXML
    private AnchorPane anchorPane;

    @FXML
    private ScrollPane scrollPane;

    @FXML
    private SplitPane splitPane;

    @FXML
    private StackedBarChart<String, Number> stackedBarChart;

    @FXML
    private TableView<String> tableView;

    @FXML
    private CategoryAxis categoryAxis;

    @FXML
    private NumberAxis numberAxis;

    private ObservableList<String> tableList;

    private ObservableList<Integer> chartValueList = FXCollections.observableArrayList();

    public void setTableList(ObservableList<String> tableList) {
        this.tableList = FXCollections.observableList(tableList);
    }

    public void setChartValueList(ObservableList<Integer> chartValueList) {
        this.chartValueList = FXCollections.observableList(chartValueList);
    }

    @Override
    public void initialize(URL location, ResourceBundle resources) {

    }

    public void setChart(){
        XYChart.Series<String,Number> series1 = new XYChart.Series();

        series1.getData().add(new XYChart.Data("January", chartValueList.get(0)));
        series1.getData().add(new XYChart.Data("February", chartValueList.get(1)));
        series1.getData().add(new XYChart.Data("March", chartValueList.get(2)));
        series1.getData().add(new XYChart.Data("April", chartValueList.get(3)));

        XYChart.Series<String,Number> series2 = new XYChart.Series();

        series2.getData().add(new XYChart.Data("January", chartValueList.get(0)));
        series2.getData().add(new XYChart.Data("February", chartValueList.get(1)));
        series2.getData().add(new XYChart.Data("March", chartValueList.get(2)));
        series2.getData().add(new XYChart.Data("April", chartValueList.get(3)));

        stackedBarChart.getData().addAll(series1, series2);
    }
}

Main.java

package sample;

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.concurrent.Task;
import javafx.event.EventHandler;
import javafx.fxml.FXMLLoader;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.input.DragEvent;
import javafx.scene.input.MouseEvent;
import javafx.stage.Screen;
import javafx.stage.Stage;
import javafx.util.StringConverter;
import javafx.util.converter.NumberStringConverter;
import javafx.util.converter.ShortStringConverter;

import java.text.DecimalFormat;
import java.text.NumberFormat;
import java.text.ParseException;
import java.util.Currency;
import java.util.Locale;
import java.util.Random;
import java.util.stream.IntStream;

public class Main extends Application {

    private final int NUMBER_OF_COPIES = 5;
    private final int NUMBER_OF_ROWS = 10;
    private ObservableList<String> tableList = FXCollections.observableArrayList();
    private ObservableList<Integer> chartValueList = FXCollections.observableArrayList();


    @Override
    public void start(Stage primaryStage) throws Exception{

        for(int i=0; i<NUMBER_OF_COPIES; i++) {
            FXMLLoader loader = new FXMLLoader(getClass().getResource("/split.fxml"));
            Parent parent = loader.load();
            Controller controller = loader.getController();
            fillChartValueList();
            controller.setChartValueList(chartValueList);
            controller.setChart();
            Scene scene = new Scene(parent, 600, 600);
            Stage stage = new Stage();
            stage.setScene(scene);
            //stage.setX(Screen.getPrimary().getBounds().getMaxX());
            stage.show();
        };
    }


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

    private void fillChartValueList(){

        // clear previous values
        chartValueList.clear();

        Random rand = new Random();
        int min = 1000;
        int max = 8000;


        for(int i=0; i<NUMBER_OF_ROWS; i++) {
            int randomNum = rand.nextInt((max - min) + 1) + min;
            chartValueList.add(randomNum);
        }
    }
}

split.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.chart.*?>
<?import javafx.scene.image.*?>
<?import javafx.scene.text.*?>
<?import java.lang.*?>
<?import java.util.*?>
<?import javafx.scene.*?>
<?import javafx.scene.control.*?>
<?import javafx.scene.layout.*?>


<AnchorPane fx:id="anchorPane" maxHeight="-Infinity" maxWidth="-Infinity" minHeight="-Infinity" minWidth="-Infinity" prefHeight="365.0" prefWidth="767.0" xmlns="http://javafx.com/javafx/8" xmlns:fx="http://javafx.com/fxml/1" fx:controller="sample.Controller">
   <children>
      <ScrollPane fx:id="scrollPane" prefHeight="364.0" prefWidth="778.0">
         <content>
            <FlowPane prefHeight="353.0" prefWidth="745.0">
               <children>
                  <SplitPane fx:id="splitPane" dividerPositions="0.25" prefHeight="363.0" prefWidth="773.0">
                     <items>
                        <TableView fx:id="tableView" prefHeight="458.0" prefWidth="251.0">
                          <columns>
                            <TableColumn prefWidth="75.0" text="C1" />
                            <TableColumn prefWidth="75.0" text="C2" />
                          </columns>
                        </TableView>
                        <StackedBarChart fx:id="stackedBarChart" prefHeight="210.0" prefWidth="107.0">
                          <xAxis>
                            <CategoryAxis fx:id="categoryAxis" side="BOTTOM" label="Year" />
                          </xAxis>
                          <yAxis>
                            <NumberAxis fx:id="numberAxis" side="LEFT" label="Value"/>
                          </yAxis>
                        </StackedBarChart>
                     </items>
                  </SplitPane>
               </children>
            </FlowPane>
         </content>
      </ScrollPane>
   </children>
</AnchorPane>