Java tutorial
import javafx.application.Application; import javafx.scene.Group; import javafx.scene.Scene; import javafx.scene.control.ComboBox; import javafx.scene.layout.GridPane; import javafx.scene.paint.Color; import javafx.scene.shape.Rectangle; import javafx.stage.Stage; public class Main extends Application { public static void main(String[] args) { Application.launch(args); } @Override public void start(final Stage primaryStage) { Group root = new Group(); Scene scene = new Scene(root, 400, 300, Color.WHITE); GridPane gridpane = new GridPane(); ComboBox<Rectangle> cmb = new ComboBox<Rectangle>(); cmb.getItems().addAll(new Rectangle(10, 10, Color.RED), new Rectangle(10, 10, Color.GREEN), new Rectangle(10, 10, Color.BLUE)); gridpane.add(cmb, 2, 0); root.getChildren().add(gridpane); primaryStage.setScene(scene); primaryStage.show(); } }