   <vaadin-combo-box label="Driver"
                              items="[[ _drivers ]]"
                              value="{{ _selectedDriver }}"
                              readonly="[[ isDriverConnected ]]">
            </vaadin-combo-box>

            <!-- Custom initialization script editor -->
            <div hidden$="[[ !_isCustomScript ]]">
                <textarea id="customScriptEditor" rows="10"
                          value="{{ _customScriptBody::input }}"></textarea>
            </div>
