docs: function () {
                  for (var key in this.$selectionMap) {
                      if (this.$selectionMap.hasOwnProperty(key)) {
                          delete this.$selectionMap[key];
                      }
                  }
                  if (!this.$.selectedItems.isEmpty()) {
                      this.$.selectedItems.clear({silent: true});
                  }
                  this.$currentSelectionIndex = -1;
  
                  this.trigger('selectionChanged');
              }