GridPane

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Region;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

/**
 *
 * @author Osculator106
 */
public class Test extends Application {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {

   int l_col_span = 2;
   GridPane l_grid_pane = new GridPane();
   l_grid_pane.setPadding(new Insets(0, 0, 0, 5));
   l_grid_pane.setVgap(10);
   l_grid_pane.setHgap(10);

   Label l_category = new Label("Categories");

   l_grid_pane.getChildren().add(l_category);
   GridPane.setConstraints(l_category, 2, 1);
   GridPane.setColumnSpan(l_category, l_col_span);


   Label l_content = new Label("Content");

   l_grid_pane.getChildren().add(l_content);
   GridPane.setConstraints(l_content, 4, 1);
   GridPane.setColumnSpan(l_content, l_col_span);


    Button newCat = new Button("New Category");
    newCat.setOnAction(new EventHandler<ActionEvent>() {
        @Override public void handle(ActionEvent e) {
            System.out.println("Clicked");
        }
    });
    l_grid_pane.getChildren().add(newCat);
    GridPane.setConstraints(newCat, 6, 1);
    GridPane.setColumnSpan(newCat, l_col_span);
    //l_grid_pane.setGridLinesVisible(true);

    HBox l_hbox = new HBox();
    l_hbox.getChildren().add(l_grid_pane);
    l_hbox.setPrefSize(500, 600);

    Scene scene = new Scene(l_hbox);
    primaryStage.setScene(scene);
    primaryStage.show();
    }
}