import javafx.application.Application;
import javafx.geometry.VPos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.*;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextFlow;
import javafx.stage.Stage;
import java.lang.System;

public class ConstraintsOnGridPane extends Application {

    static public void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(final Stage primaryStage) throws Exception {
        //simple example that shows that rowConstraints.setValignment(VPos.<all>); is not working
        GridPane pane = new GridPane();
        pane.add(new Label("This text should be at BOTTOM of the pane"), 0, 0);
        pane.setStyle("-fx-background-color: LightGreen");
        final RowConstraints constraints = new RowConstraints();
        constraints.setValignment(VPos.BOTTOM);

        pane.getRowConstraints().add(constraints);
        pane.setPrefSize(300, 300);

        primaryStage.setScene(new Scene(pane));
        primaryStage.show();

    }
}