How to create dynamically changing applications using JavaFx?

Question

Java

Here, for example, there is a very simple "application":
https://mathcalc.tk/matrix-mul-matrix/
How can this be done in JavaFX?
I can "implement" such a thing in FXML - it's not difficult. But I can only do this with a specific number of rows and columns. But as you can see, in this application you can dynamically change the number of rows and columns.
How is this done in JavaFx?

Answer 1

yes, an excerpt from

ImageCustom imageCustom = new ImageCustom();
                imageCustom.setFitHeight(150);
                imageCustom.setFitWidth(150);
                imageCustom.setPickOnBounds(true);
                imageCustom.setPreserveRatio(true);

                imageCustom.setURL(strExport + resultSet.getString("id").trim() + strJPG);
                imageCustom.setImage(image);
                imageLayout.add(imageCustom, 0, imageLayout.getChildren().size()); // вот что нужно

here an object is dynamically created, by clicking the user