public ObjectProperty<TextSize> textSizeProperty() {
        if (null == textSize) {
            textSize = new ObjectPropertyBase<TextSize>(_textSize) {
                @Override protected void invalidated() { fireTileEvent(REDRAW_EVENT);}
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "textSize"; }
            };
        }
        return textSize;
    }
Defines the text size that will be used for the title,
subtitle and text in the different skins.
@param SIZE
src/main/java/eu/hansolo/tilesfx/Tile.java