JavaFX TextField set text alignment

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;
import javafx.stage.Stage;

public class Main extends Application {

  public void start(Stage primaryStage) {
    GridPane pane = new BinaryPane(5);

    Scene scene = new Scene(pane, 400, 400);
    primaryStage.setScene(scene);/*from   w w w.j  a va 2 s  .c om*/
    primaryStage.setTitle("Checkerboard");
    primaryStage.setMinHeight(400);
    primaryStage.setMinWidth(400);
    primaryStage.show();
  }

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

class BinaryPane extends GridPane {
  BinaryPane(int n) {
    for (int col = 0; col < n; col++) {
      for (int row = 0; row < n; row++) {
        int random = (int) (Math.random() * 2);
        String binary = (random == 0) ? "0" : "1";
        TextField textField = new TextField(binary);
        textField.setPrefColumnCount(1);
        textField.setAlignment(Pos.CENTER);
        textField.setEditable(false);
        add(textField, col, row);
      }
    }
  }
}