Because there is no visible-property, I try to show/hide tabs by adding/removing them from the tabPane.

However, in Java 8u20, the tabs don't reappear after adding them again.

The following code can be used to reproduced the bug:

{code}
package be.iminds.ilabt.jfed.experimenter_gui;
/**
 * User: twalcari
 * Date: 11/10/2014
 * Time: 16:15
 */

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Tab;
import javafx.scene.control.TabPane;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;

import java.util.Random;

public class TabsTest extends Application {

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

    @Override
    public void start(Stage primaryStage) {

        BorderPane container = new BorderPane();
        container.setPrefSize(600, 400);

        TabPane tabPane = new TabPane();
        container.setCenter(tabPane);

        Tab[] tabs = new Tab[5];

        for (int i = 0; i < tabs.length; i++) {
            tabs[i] = new Tab("Tab " + i);
            tabs[i].setContent(new Label("Content of Tab " + i));

            tabPane.getTabs().add(tabs[i]);
        }

        Button button = new Button("Remove and add tab again");
        container.setBottom(button);

        button.setOnAction(ae -> {
            int index = new Random().nextInt(tabs.length);
            System.out.println("Removing and adding tab " + index);

            tabPane.getTabs().remove(tabs[index]);
            tabPane.getTabs().add(tabs[index]);
        });

        primaryStage.setScene(new Scene(container));
        primaryStage.show();
    }
}

{code}



 Also, the last tab disappears in the process (ex. after "Tab 2" is removed and added again, "Tab 4" disappears too)