public void setIcon(final Image IMAGE) {
        if (null == icon) {
            _icon = IMAGE;
            fireSectionEvent(UPDATE_EVENT);
        } else {
            icon.set(IMAGE);
        }
    }
Defines an image for the section.
In some skins the image will be drawn (e.g. SimpleSkin)
@param IMAGE
src/main/java/eu/hansolo/tilesfx/Section.java