JavaFX/ControlsFX SearchableCombobox Example

import com.sun.javafx.scene.control.skin.ComboBoxListViewSkin;
import impl.org.controlsfx.skin.SearchableComboBoxSkin;
import javafx.application.Application;
import javafx.collections.transformation.FilteredList;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.ListView;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
import javafx.util.StringConverter;
import org.controlsfx.control.SearchableComboBox;

public class Main extends Application {
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        //Setup
        BorderPane root = new BorderPane();
        primaryStage.setScene(new Scene(root));

        //Do some other stuff
        root.setTop(new Label("SearchableComboBox Example:"));

        //...

        //Make the combobox
        SearchableComboBox<Person> comboBox = makeCombobox();
        root.setCenter(comboBox);

        //Optional way to override displaying the `toString()` values
        //You can remove this if you want
        comboBox.setConverter(new StringConverter<Person>() {
            @Override
            public String toString(Person obj) {
                return obj.fName + " " + obj.lName;
            }

            @Override
            public Person fromString(String string) {
                return null;
            }
        });

        //Do some more stuff
        //Display the currently selected item at the bottom
        Label lbl_selected = new Label();
        comboBox.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {
            if (newValue == null) lbl_selected.setText("");
            else lbl_selected.setText(newValue.toString());
        });
        root.setBottom(lbl_selected);

        //...

        //Set an initial selected value (optional)
        comboBox.getSelectionModel().select(10);

        //Finally show the window
        primaryStage.show();
    }

    /**
     * @return  A searchable combobox with some default values
     */
    private SearchableComboBox<Person> makeCombobox() {
        //Some values to display in the combobox
        Person[] people = new Person[] {
                new Person("Chandler", "Bing"),
                new Person("Ross", "Geller"),
                new Person("Monica", "Geller"),
                new Person("Rachel", "Green"),
                new Person("Phoebe", "Buffay"),

                new Person("April", "Ludgate"),
                new Person("Leslie", "Knope"),
                new Person("Ron", "Swanson"),
                new Person("Jerry", "Gergich"),
                new Person("Andy", "Dwyre"),
                new Person("Ann", "Perkins"),
                new Person("Donna", "Meagle"),
                new Person("Tom", "Haverford"),
                new Person("Mark", "Brendanawicz")
        };

        //Make the combobox
        SearchableComboBox<Person> comboBox = new SearchableComboBox<>();
        comboBox.getItems().addAll(people);

        //================================
        //If you want to programmatically select a value you should include the following as well
        //Chances are you will, so this will save you a bit of debugging/searching
        //See the bug report here: https://bugs.openjdk.java.net/browse/JDK-8129123

        //Automatically scroll to the last selected value when opening
        comboBox.showingProperty().addListener((observable, oldValue, newValue) -> {
            int selectedIndex = comboBox.getSelectionModel().getSelectedIndex();
            //Do nothing on close or if nothing is selected
            if (!newValue || selectedIndex < 0) return;

            //Get the inner combobox used to display the elements in the popup
            SearchableComboBoxSkin<?> searchableComboBoxSkin = (SearchableComboBoxSkin<?>) comboBox.getSkin();
            FilteredList<Node> filtered = searchableComboBoxSkin.getChildren().filtered(node -> node instanceof ComboBox<?>);
            if (filtered.size() <= 0) return;
            ComboBox<?> innerComboBox = (ComboBox<?>) filtered.get(0);

            //Scroll to the selected element in the combobox
            ComboBoxListViewSkin<?> skin = (ComboBoxListViewSkin<?>) innerComboBox.getSkin();
            skin.getListView().scrollTo(selectedIndex);
            ((ListView) skin.getPopupContent()).scrollTo(selectedIndex);
        });
        //================================

        //Return the created combobox
        return comboBox;
    }
}

/**
 * An example class to be used in the combobox.
 */
class Person {
    public String fName = "";
    public String lName = "";

    public Person(String fName, String lName) {
        this.fName = fName;
        this.lName = lName;
    }

    public String toString() {
        return lName + ", " + fName;
    }
}