    _instancesChanged() {
                this._fetchAvailableDrivers();
                this._checkForConnectedDriver();
            },

            /**
             * Gets the list of available Driver names to display in the
             * Driver selector dropdown.
             */
            _fetchAvailableDrivers() {
                this._drivers = null;

                if (!this.instances) {
                    return;
                }

                const instanceHost = this.instances[0];
        