如何从组合框删除所选元素

Question

选择元素后，元素不会从ddl中消失；

private void initRestrictedZonesSelector() {
    restrictedComboBox.setOnShowing((e) ->
            ((FilteredList) restrictedComboBox.getItems()).setPredicate(p -> !selectedRestrictedZones.contains(p)));
    restrictedComboBox.setOnAction(e -> setRestrictedMarkets());
}

private void setRestrictedMarkets() {
    if (StringHelper.isEmpty(String.valueOf(restrictedComboBox.getValue()))) {
        return;
    }

    selectedRestrictedZones.add(String.valueOf(restrictedComboBox.getValue()));

    RestrictedZone zone = new RestrictedZone(restrictedComboBox.getValue() + "", selectedRestricted);

    zone.setOnDelete((event1) -> Platform.runLater(() -> selectedRestrictedZones.remove(zone.getMarketName())));

    selectedRestricted.getChildren().add(zone);
}