To reproduce run following code



import javafx.application.Application;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Control;
import javafx.scene.control.Label;
import javafx.scene.control.MenuItem;
import javafx.scene.control.ScrollBar;
import javafx.scene.control.SplitMenuButton;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;

public class RegionBorder extends Application {

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

    private Parent getContent() {
        VBox list = new VBox(10);
        Control[] controls = new Control[4];
        controls[0] = new Button("Button");
        controls[1] = new Label("Button");
        controls[2] = new ScrollBar();
        controls[3] = new SplitMenuButton(new MenuItem("SplitMenuButton"));
        for (Control control : controls) {
            control.setStyle("-fx-border-color: green;-fx-border-width:5px;");
            list.getChildren().add(control);
        }
        return list;
    }

    public void start(Stage stage) {
        stage.setX(100);
        stage.setY(100);
        stage.setWidth(300);
        stage.setHeight(300);
        Scene scene = new Scene(getContent());
        stage.setScene(scene);
        stage.setVisible(true);
    }
}