JavaFX TextField set horizontal alignment dynamically

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.control.RadioButton;
import javafx.scene.control.TextField;
import javafx.scene.control.ToggleGroup;
import javafx.scene.input.KeyCode;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class Main extends Application {
   protected TextField tfTextField = new TextField();
   protected TextField tfColumnSize = new TextField();

   @Override//from   w ww .j  a va2s .c  o m
   public void start(Stage primaryStage) {
      // Set properties for text fields
      tfTextField.setText("JavaFX");
      tfTextField.setAlignment(Pos.BOTTOM_CENTER);
      tfColumnSize.setAlignment(Pos.BOTTOM_RIGHT);
      tfColumnSize.setPrefColumnCount(3);
      tfTextField.setPrefColumnCount(12);
      tfColumnSize.setText("12");

      // Create three radio buttons
      RadioButton rbLeft = new RadioButton("Left");
      RadioButton rbCenter = new RadioButton("Center");
      RadioButton rbRight = new RadioButton("Right");
      rbCenter.setSelected(true);

      // Create a toggle group
      ToggleGroup group = new ToggleGroup();
      rbLeft.setToggleGroup(group);
      rbCenter.setToggleGroup(group);
      rbRight.setToggleGroup(group);
      
      // Create four hbox
      HBox paneForRadioButtons = new HBox(5);
      paneForRadioButtons.getChildren().addAll(rbLeft, rbCenter, rbRight);
      paneForRadioButtons.setAlignment(Pos.BOTTOM_LEFT);

      HBox paneForColumnSize = new HBox(5);
      paneForColumnSize.getChildren().addAll(
         new Label("Colum Size"), tfColumnSize);

      HBox paneForTextField = new HBox(5);
      paneForTextField.setAlignment(Pos.CENTER);
      paneForTextField.getChildren().addAll(
         new Label("Text Field"), tfTextField);

      HBox hbox = new HBox(10);
      hbox.getChildren().addAll(paneForRadioButtons, paneForColumnSize);

      // Create a vBox and place nodes in it
      VBox pane = new VBox(10);
      pane.setPadding(new Insets(5, 5, 5, 5));
      pane.getChildren().addAll(paneForTextField, hbox);

      // Create and register the handlers 
      rbLeft.setOnAction(e -> {
         if (rbLeft.isSelected()) {
            tfTextField.setAlignment(Pos.BOTTOM_LEFT);
         }
      });

      rbCenter.setOnAction(e -> {
         if (rbCenter.isSelected()) {
            tfTextField.setAlignment(Pos.BOTTOM_CENTER);
         }
      });

      rbRight.setOnAction(e -> {
         if (rbRight.isSelected()) {
            tfTextField.setAlignment(Pos.BOTTOM_RIGHT);
         }
      });

      tfColumnSize.setOnKeyPressed(e -> {
         if (e.getCode() == KeyCode.ENTER) {
            tfTextField.setPrefColumnCount(Integer.parseInt(
               tfColumnSize.getText()));
         }
      });

      // Create a scene and place it in the stage
      Scene scene = new Scene(pane);
      primaryStage.setTitle("java2s.com");
      primaryStage.setScene(scene);
      primaryStage.show();
   }
}