code: public boolean containsFeature(Feature feature) {
  		switch (feature) {
  			case DRILLDOWN:
  				return !getDrilldownOptions().isEmpty();
  			case GLOBAL:
  				return getGlobal() != null;
  			case INTERACTION:
  				return !getInteractionFunctions().isEmpty();
  			case LIVEDATA:
  				return !getLiveDataSeries().isEmpty();
  			case SELECTION:
  				return !getSelectionFunctions().isEmpty();
  			default:
  				throw new UnsupportedFeatureException(feature);
  		}
  	}
docs: Returns true if the {@link Options} attached to this context contains the
  given feature.
  
  @param feature
  the feature for which to look.
  @return true if the context contains this feature, false if not.