docs: function NavigationOutliner(options) {
  		var parent = lib.node(options.parent);
  		if (!parent) { throw "no parent"; } //$NON-NLS-0$
  		if (!options.serviceRegistry) {throw "no service registry"; } //$NON-NLS-0$
  		this._parent = parent;
  		this._registry = options.serviceRegistry;
  		this.commandService = options.commandService;
  		this.render();
  	}