             },
                /**
                 * When true, the Driver settings expander is opened.
                 */
                _showDetails: {
                    type: Boolean,
                    value: false,
                },
            },

            observers: [
                '_instancesChanged(instances)',
            ],

            /**
             * Called when the list of Instances changes, typically when a
             * different Cluster is selected.
             */
        