@Override
    public Dialog show(Stage stage, Action action) {
        Dialog dialog = super.show(stage, action);
        stage.setScrollFocus(scrollPane);
        validate();
        scrollPane.setScrollY(scrollPosition);
        
        fire(new DialogEvent(DialogEvent.Type.OPEN));
        return dialog;
    }
Recreates the drawables array only including visible drawables.
core/src/com/ray3k/skincomposer/dialog/DialogDrawables.java