/** @return Top-level {@link Node} */
  public Node create() {
    // Layout:
    //
    // | table |  [Add]
    // | table |  [Remove]
    // | table |
    // | table |

    // Create table with editable columns for type Double (supported as Number)
    final TableColumn<Point, Number> x_col = new TableColumn<>(Messages.PointsTable_X);
    x_col.setCellValueFactory(
        new Callback<TableColumn.CellDataFeatures<Point, Number>, ObservableValue<Number>>() {
          @Override
          public ObservableValue<Number> call(CellDataFeatures<Point, Number> param) {
            return new SimpleDoubleProperty(param.getValue().getX());
          }
        });
    x_col.setCellFactory(
        TextFieldTableCell.<Point, Number>forTableColumn(new NumberStringConverter()));
    x_col.setOnEditCommit(
        event -> {
          final int row = event.getTablePosition().getRow();
          points.setX(row, event.getNewValue().doubleValue());
        });

    final TableColumn<Point, Number> y_col = new TableColumn<>(Messages.PointsTable_Y);
    y_col.setCellValueFactory(
        new Callback<TableColumn.CellDataFeatures<Point, Number>, ObservableValue<Number>>() {
          @Override
          public ObservableValue<Number> call(CellDataFeatures<Point, Number> param) {
            return new SimpleDoubleProperty(param.getValue().getY());
          }
        });
    y_col.setCellFactory(
        TextFieldTableCell.<Point, Number>forTableColumn(new NumberStringConverter()));
    y_col.setOnEditCommit(
        event -> {
          final int row = event.getTablePosition().getRow();
          points.setY(row, event.getNewValue().doubleValue());
        });

    final ObservableList<Point> data = new PointsAdapter(points);
    final TableView<Point> table = new TableView<>(data);
    table.getColumns().add(x_col);
    table.getColumns().add(y_col);
    table.setColumnResizePolicy(TableView.CONSTRAINED_RESIZE_POLICY);
    table.setPlaceholder(new Label(Messages.PointsTable_Empty));
    table.setEditable(true);

    // Buttons
    final Button add = new Button(Messages.Add, JFXUtil.getIcon("add.png"));
    add.setMaxWidth(Double.MAX_VALUE);
    add.setOnAction(event -> data.add(new Point(0, 0)));

    final Button remove = new Button(Messages.Remove, JFXUtil.getIcon("delete.png"));
    remove.setMaxWidth(Double.MAX_VALUE);
    remove.setOnAction(
        event -> {
          final int sel = table.getSelectionModel().getSelectedIndex();
          if (sel >= 0) data.remove(sel);
        });

    final VBox buttons = new VBox(10, add, remove);
    final HBox content = new HBox(10, table, buttons);
    HBox.setHgrow(table, Priority.ALWAYS);
    return content;
  }
 @Override
 protected Point doRemove(final int index) {
   final Point removed = points.get(index);
   points.delete(index);
   return removed;
 }
 @Override
 protected Point doSet(final int index, final Point element) {
   final Point old = new Point(points.getX(index), points.getY(index));
   points.set(index, element.getX(), element.getY());
   return old;
 }
 @Override
 protected void doAdd(final int index, final Point element) {
   points.insert(index, element.getX(), element.getY());
 }
 @Override
 public int size() {
   return points.size();
 }
 @Override
 public Point get(final int index) {
   return points.get(index);
 }