code: function (name, value, oldValue) {
                  this.$InputElement.onbind.apply(this, arguments);
                  if (name === "checked") {
                      this._domElt.checked = value;
                  }
              }
docs: Function called when a value inside 'bind' has changed.
  @param {String} name Name of the property
  @param {Object} value Value of the changed property
  @param {Object} oldValue Value of the property before the change happened