public void setRadarChartMode(final RadarChartMode MODE) {
        if (null == radarChartMode) {
            _radarChartMode = MODE;
            fireTileEvent(RECALC_EVENT);
        } else {
            if (!radarChartMode.isBound()) {
                radarChartMode.set(MODE);
            }
        }
    }
Defines the mode that is used in the RadarChartTileSkin
to visualize the data in the RadarChart.
There are Mode.POLYGON and Mode.SECTOR.
@param MODE
src/main/java/eu/hansolo/tilesfx/Tile.java