docs: function() {
  			var me = this;
  			var barCount = 0;
  			helpers.each(me.chart.data.datasets, function(dataset, datasetIndex) {
  				var meta = me.chart.getDatasetMeta(datasetIndex);
  				if (meta.bar && me.chart.isDatasetVisible(datasetIndex)) {
  					++barCount;
  				}
  			}, me);
  			return barCount;
  		}