import javafx.application.Application;
import javafx.geometry.Orientation;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Separator;
import javafx.stage.Stage;

/**
 *
 * @author lans
 */
public class VerticalSeparatorFail extends Application {

    
    @Override
    public void start(Stage primaryStage) throws Exception {
        final Separator separator = new Separator(Orientation.HORIZONTAL);
        separator.setPrefHeight(100);
        separator.setPrefWidth(100);
        separator.setTranslateX(200);
        separator.setTranslateY(100);
        Button b = new Button("Toggle orientation");
        b.setOnAction((e) -> separator.setOrientation(separator.getOrientation() == Orientation.VERTICAL ?  Orientation.HORIZONTAL :  Orientation.VERTICAL));
        Group group = new Group(b, separator);
        Scene scene = new Scene(group, 400, 400);
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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