import javafx.application.Application;
import javafx.application.Launcher;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextBox;
import javafx.scene.control.Tooltip;
import javafx.stage.Stage;

public class Main extends Application {        
    public static void main(String[] args) {
        
        Launcher.launch(Main.class, args);
    }
    
    @Override 
    public void start(Stage stage) {
      
        stage.setHeight(100.0);
        stage.setWidth(200.0);
        
        final Group root = new Group();
        Scene scene = new Scene(root);        
                   
        TextBox tb = new TextBox();
        tb.setTooltip(new Tooltip("Test"));
        tb.relocate(0, 30);
        
        Button button = new Button("Remove box");
        button.setOnAction(new EventHandler<ActionEvent>() {
            public void handle(ActionEvent e) {
                root.getChildren().remove(1);
                System.gc();
            }
        });
        
        root.getChildren().addAll(button, tb); 
        stage.setScene(scene);           
        stage.setVisible(true); 
    }      
}