dataset" index-as="datasetIndex">
            <div class="legend-row">
                <paper-checkbox noink checked="true" class="feature-checkbox"
                                style="[[_getLegendBoxStyle(_dataModel, datasetIndex)]]"
                                id="[[_getDatasetId(datasetIndex)]]" on-change="_datasetCheck">
                                [[_getDatasetName(_dataModel, datasetIndex)]]
                </paper-checkbox>
            </div>
          </template>
        </div>
      </te