FULL PRODUCT VERSION :
java version "1.8.0_92"
Java(TM) SE Runtime Environment (build 1.8.0_92-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.92-b14, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
When the tabs are sorted, the tab selection menu gets empty.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Create a TabPane with several tabs so that all tabs do not fit into the window, and a tab selection menu button appears at the right of the tab header.
2. Sort the tabs:
tabPane.getTabs().sort((o1, o2) -> o2.getText().compareTo(o1.getText()));


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Tab selection menu contains all tabs' names
ACTUAL -
Tab selection menu is empty

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
public class TabPaneTest extends Application {

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

    int i = 1;

    @Override
    public void start(Stage primaryStage) throws Exception {
        TabPane tabPane = new TabPane();
        tabPane.setSkin(new MyTabPaneSkin(tabPane));

        tabPane.getTabs().add(new Tab("My beautiful tab " + i, new TextArea("pane " + (i++))));

        Button add = new Button("Add new tab");
        add.setOnAction(event -> {
            tabPane.getTabs().add(new Tab("My beautiful tab " + i, new TextArea("pane " + (i++))));
        });

        Button addSort = new Button("Add new tab & sort");
        addSort.setOnAction(event -> {
            tabPane.getTabs().add(new Tab("My beautiful tab " + i, new TextArea("pane " + (i++))));
            tabPane.getTabs().sort((o1, o2) -> o2.getText().compareTo(o1.getText()));
        });
        Button sort = new Button("Sort tabs");
        sort.setOnAction(event -> {
            tabPane.getTabs().sort((o1, o2) -> o2.getText().compareTo(o1.getText()));
        });

        VBox vbox = new VBox(tabPane, new HBox(add, addSort, sort));

        primaryStage.setScene(new Scene(vbox));
        primaryStage.setWidth(400);
        primaryStage.setHeight(300);
        primaryStage.show();
    }
}
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
As a workaround, one might remove all tabs, sort the list, and then add them back:

            List<Tab> tabs = Lists.newArrayList(tabPane.getTabs());
            tabs.sort((o1, o2) -> o2.getText().compareTo(o1.getText()));
            tabPane.getTabs().clear();
            tabPane.getTabs().setAll(tabs);