code: function (elt) {
              this._initializeFocusableElement();
              this._label = null;
              var labels = this.getDom().getElementsByTagName("label");
              if (labels.length > 0) {
                  this._label = labels[0];
                  labels = null;
              }
          }
docs: Internal method to override to initialize a widget (e.g. to listen to DOM events)
  @param {HTMLElement} elt the Input markup DOM elt - never null