material_comboBox_type.getItems().addAll(types);

    material_comboBox_type.setCellFactory((ListView<SimpleTableObject>
    param) -> {
          final ListCell<SimpleTableObject> cell = new
     ListCell<SimpleTableObject>() {
            @Override
            public void updateItem(SimpleTableObject item, boolean empty) {
                super.updateItem(item, empty);
                if (item != null) {

                    setText(item.getName().get());//return String, actuall name of material

                }
                else {
                    setText(null);
                }
            }
        };
        return cell;
    });

private static class SimpleTableObjectListCell extends ListCell<SimpleTableObject> {

    @Override
    public void updateItem(SimpleTableObject item, boolean empty) {
        super.updateItem(item, empty);
        if (item != null) {

            setText(item.getName().get());//return String, actuall name of material

        }
        else {
            setText(null);
        }
    }

}

materialComboBoxType.setCellFactory(listView -> new SimpleTableObjectListCell());
materialComboBoxType.setButtonCell(new SimpleTableObjectListCell());

material_comboBox_type.setConverter(new StringConverter<SimpleTableObject>() {
        @Override
        public String toString(SimpleTableObject object) {
            return object.getName().get();
        }

        @Override
        public SimpleTableObject fromString(String string) {
            throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
        }
    });