'span');
    this.$closeButton.setAttribute('id', 'references-pane-close');
    this.$closeButton.addEventListener('click', function (e) {
      this.deactivate();
    }.bind(this));
    this.$header.appendChild(this.$closeButton);

    this.$pane.appendChild(this.$header);
    var tableContainer = document.createElement('div');
    tableContainer.setAttribute('id', 'references-pane-table-container');

    this.$table = document.createElement('table');
    this.$table.setAttribute('id', 'references-pane-tab