How can I replace inheritence of SkinBase in JavaFX11

Question

I'm migrating an application containing JavaFX 2 to OpenJDK11. I have an error due to disappearance of inheritance of SkinBase with StackPane. I can't use anymore methods like event methods (defined in Node), getChildren() (defined in Parent) and many others that require inheritence...

This my previous Class in Java 1.7, that I want in JDK11 :

public class WellPlateSkin<T> extends SkinBase<WellPlate, WellPlateSkin.DummyBehaviour>
{
    public WellPlateSkin(final WellPlate control) {
        super(control, new DummyBehaviour(control));
...
setOnMouseDragged(new EventHandler<MouseEvent>()
        {
            @Override
            public void handle(MouseEvent mouseEvent)
            {
                dragging = true;
                onMouseDragged(mouseEvent);

            }
        });
        setOnMousePressed(new EventHandler<MouseEvent>()
        {
            @Override
            public void handle(MouseEvent mouseEvent)
            {
                mousePressed = new Point2D(mouseEvent.getX(), mouseEvent.getY());
                getChildren().add(glass);
                removeSelection();
                rubber.setHeight(0);
                rubber.setWidth(0);
                dragging = false;
            }
        });

        setOnMouseReleased(new EventHandler<MouseEvent>()
        {
            @Override
            public void handle(MouseEvent mouseEvent)
            {
                if (!dragging) {
                    selectNode(new Point2D(mouseEvent.getX(),mouseEvent.getY()));

                }
                mousePressed = null;
                getChildren().remove(glass);
                dragging =false;
            }
        });

These methods inherit from Class Node or Parent That's worked because the signature of SkinBase was (before JavaFX8) :

public abstract class SkinBase<C extends Control, B extends BehaviorBase<C>> extends StackPane implements Skin<C> { 

And StackPane is a child of Pane which is a child of Region which is a child of Parent and which is a child of Node.

Now, in JDK11, the signature of SkinBase is

public abstract class SkinBase<C extends Control> implements Skin<C> {

The Inheritence doesn't exist anymore and these functions are no more defined (the super() neither). What is the best way to sovle this issue ? Thank you for your answer !