code: function onClick (ev, elements) {
    var model = this._Ampersandview.model;
    var partition = model.filter.partitions.get(1, 'rank');
  
    if (elements.length > 0) {
      partition.updateSelection(partition.groups.models[elements[0]._index]);
      model.filter.updateDataFilter();
      app.me.dataview.getData();
    }
  }
docs: Called by Chartjs, this -> chart instance