JavaFX ScrollBar set color

import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.ScrollBar;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.paint.Color;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Main extends Application {
   @Override/* www  . j a v a2s .c o  m*/
   public void start(Stage primaryStage) {
      Text tShowColors = new Text("Show Colors");
      Label lbRed = new Label("Red");
      Label lbGreen = new Label("Green");
      Label lbBlue = new Label("Blue");
      Label lbOpacity = new Label("Opacity");
      ScrollBar sbRed = new ScrollBar();
      ScrollBar sbGreen = new ScrollBar();
      ScrollBar sbBlue = new ScrollBar();
      ScrollBar sbOpacity = new ScrollBar();
      sbRed.setMin(0);
      sbRed.setMax(1);
      sbGreen.setMin(0);
      sbGreen.setMax(1);
      sbBlue.setMin(0);
      sbBlue.setMax(1);
      sbOpacity.setMin(0);
      sbOpacity.setMax(1);
      sbOpacity.setValue(1);

      ChangeListener<Number> changeColor = (observedValue, oldValue, newValue) -> {
         double red = sbRed.getValue();
         double green = sbGreen.getValue();
         double blue = sbBlue.getValue();
         double opacity = sbOpacity.getValue();
         tShowColors.setFill(new Color(red, green, blue, opacity));
      };

      sbRed.valueProperty().addListener(changeColor);
      sbGreen.valueProperty().addListener(changeColor);
      sbBlue.valueProperty().addListener(changeColor);
      sbOpacity.valueProperty().addListener(changeColor);

      GridPane gridPane = new GridPane();
      gridPane.addColumn(0, lbRed, lbGreen, lbBlue, lbOpacity);
      gridPane.addColumn(1, sbRed, sbGreen, sbBlue, sbOpacity);
      gridPane.setHgap(10);
      gridPane.setVgap(5);

      BorderPane pane = new BorderPane();
      pane.setTop(tShowColors);
      pane.setCenter(gridPane);
      pane.setAlignment(tShowColors, Pos.CENTER);
      pane.setMargin(tShowColors, new Insets(20));
      pane.setMargin(gridPane, new Insets(0, 20, 20, 20));

      Scene scene = new Scene(pane);
      primaryStage.setTitle("E16_17");
      primaryStage.setScene(scene);
      primaryStage.show();
   }

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