public void setTextSize(final TextSize SIZE) {
        if (null == textSize) {
            _textSize = SIZE;
            fireTileEvent(REDRAW_EVENT);
        } else {
            if (!textSize.isBound()) {
                textSize.set(SIZE);
            }
        }
    }
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