public ObjectProperty<Orientation> orientationProperty() {
        if (null == orientation) {
            orientation  = new ObjectPropertyBase<Orientation>(_orientation) {
                @Override protected void invalidated() { fireTileEvent(RESIZE_EVENT); }
                @Override public Object getBean() { return Tile.this; }
                @Override public String getName() { return "orientation"; }
            };
            _orientation = null;
        }
        return orientation;
    }
Defines the orientation of the control. This feature
will only be used in the BulletChartSkin and LinearSkin.
Values are HORIZONTAL and VERTICAL

@param ORIENTATION
src/main/java/eu/hansolo/tilesfx/Tile.java