code: public void setRadarChartMode(final RadarChart.Mode MODE) {
          if (null == radarChartMode) {
              _radarChartMode = MODE;
              fireTileEvent(RECALC_EVENT);
          } else {
              radarChartMode.set(MODE);
          }
      }
docs: 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