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 * and open the template in the editor.
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package javaapplication37;

import java.util.ArrayList;
import java.util.List;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.event.EventType;
import javafx.geometry.Side;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.control.SplitPane;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.control.TabPane.TabClosingPolicy;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

/**
 *
 * @author jfdenise
 */
public class DividerTest extends Application {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        Application.launch(args);
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        VBox vbox = new VBox();
      
        Scene scene = new Scene(vbox, 500, 500);        
        final SplitPane sp = new SplitPane();
        AnchorPane ap = new AnchorPane();
        
        ap.setPrefSize(300, 300);
        ap.setMinWidth(50);
        ap.setMinHeight(50);
        sp.getItems().add(ap);
        AnchorPane ap2 = new AnchorPane();
        ap2.resize(300, 300);
        ap2.setMinWidth(50);
        ap2.setMinHeight(50);
        sp.getItems().add(ap2);
        final Button b = new Button();
        b.setOnAction(new EventHandler() {

            @Override
            public void handle(Event t) {
                System.out.println("BEFORE POSITONS" + sp.getDividerPositions()[0]);
                sp.setDividerPositions(100);
                
                System.out.println("AFTER POSITONS" + sp.getDividerPositions()[0]);
            }
        });
        vbox.getChildren().addAll(sp, b);
        primaryStage.setScene(scene);
        primaryStage.show();
    }
    
    public Tab createTab(ImageView icon) {
        Tab tab1 = new Tab();
        StackPane stackPane = new StackPane();
        tab1.setContent(stackPane);
        tab1.setGraphic(icon);
        return tab1;
    }
     public static Image getImage(Class<?> baseClass, String name) {
        return new Image(baseClass.getResource(name).toExternalForm());
    }
}