Пишу TreeView на Angular 2

<system.webServer>
	  <modules runAllManagedModulesForAllRequests="true"/>
	  <rewrite>
		  <rules>
			  <rule name="IndexRule" stopProcessing="true">
				  <match url=".*"/>
				  <conditions logicalGrouping="MatchAll">
					  <add input="{REQUEST_FILENAME}" matchType="IsFile" negate="true"/>
					  <add input="{REQUEST_URI}" matchType="Pattern" pattern="^/api/" negate="true"/>
				  </conditions>
				  <action type="Rewrite" url="/index.html"/>
			  </rule>
		  </rules>
	  </rewrite>
</system.webServer>

import {Component, Input, Output, EventEmitter} from 'angular2/core';

export interface ITreeNode {
	id: number;
	name: string;
	children: Array<ITreeNode>;
}

@Component({
	selector: "tree-view",
	templateUrl: "/app/components/treeview/treeview.html",
	directives: [TreeViewComponent]
})
export class TreeViewComponent {

	@Input() Nodes: Array<ITreeNode>;
	@Input() SelectedNode: ITreeNode;

	@Output() onSelectedChanged: EventEmitter<ITreeNode> = new EventEmitter();
	@Output() onRequestNodes: EventEmitter<ITreeNode> = new EventEmitter();

	constructor() { }

	onSelectNode(node: ITreeNode) {
		this.onSelectedChanged.emit(node);
	}

	onExpand(li: HTMLLIElement, node: ITreeNode) {
		if (this.isExpanden(li)) {
			li.classList.remove('expanded');
		}
		else {
			li.classList.add('expanded');

			if (node.children.length == 0) {
				this.onRequest(node);
			}
		}
	}

	onRequest(parent: ITreeNode) {
		this.onRequestNodes.emit(parent);
	}

	isExpanden(li: HTMLLIElement) {
		return li.classList.contains('expanded');
	}
}

<ul class="treenodes">
	<li #li *ngFor="#node of Nodes" class="treenode">
		<i class="nodebutton fa"
		   (click)="onExpand(li, node)"
		   [ngClass]="{'fa-minus-square-o': isExpanden(li), 'fa-plus-square-o': !isExpanden(li)}">
		</i>

		<span class="nodetext"
			  [ngClass]="{'bg-info': node == SelectedNode}"
			  (click)="onSelectNode(node)">
			{{node.name}}
		</span>

		<tree-view [Nodes]="node.children"
				   [SelectedNode]="SelectedNode"
				   (onSelectedChanged)="onSelectNode($event)"
				   (onRequestNodes)="onRequest($event)"
				   *ngIf="isExpanden(li)">
		</tree-view>
	</li>
</ul>

tree-view .treenodes {
	list-style-type: none;
	padding-left: 0;
}

tree-view tree-view .treenodes {
	list-style-type: none;
	padding-left: 16px;
}

tree-view .nodebutton {
	cursor: pointer;
}

tree-view .nodetext {
	padding-left: 3px;
	padding-right: 3px;
	cursor: pointer;
}

import {Component, OnInit} from 'angular2/core';
import {NgClass} from 'angular2/common';
import {TreeViewComponent, ITreeNode} from '../treeview/treeview.component';
import {TreeService} from '../../services/tree.service';

@Component({
	templateUrl: '/app/components/sandbox/sandbox.html',
	directives: [NgClass, TreeViewComponent]
})
export class SandboxComponent implements OnInit {

	Nodes: Array<ITreeNode>;
	selectedNode: ITreeNode; // нужен для отображения детальной информации по выбранному узлу.

	constructor(private treeService: TreeService) {
	}

	// начальное заполнение верхнего уровня иерархии
	ngOnInit() {
		this.treeService.GetNodes(0).subscribe(
			res => this.Nodes = res,
			error => console.log(error)
		);
	}
	// обработка события смены выбранного узла
	onSelectNode(node: ITreeNode) {
		this.selectedNode = node;
	}
	// обработка события вложенных узлов
	onRequest(parent: ITreeNode) {
		this.treeService.GetNodes(parent.id).subscribe(
			res => parent.children = res,
			error=> console.log(error));
	}
}

<div class="col-lg-3">
	<div class="panel panel-info">
		<div class="panel-body">
			<tree-view [Nodes]="Nodes"
					   [SelectedNode]="selectedNode"
					   (onSelectedChanged)="onSelectNode($event)"
					   (onRequestNodes)="onRequest($event)">
			</tree-view>
		</div>
	</div>
</div>

import {Injectable} from 'angular2/core';
import {Http} from 'angular2/http';
import 'rxjs/Rx';

@Injectable()
export class TreeService {
	constructor(public http: Http) {

	}
	GetNodes(parentId: number) {
		return this.http.get("/api/tree/" + parentId.toString())
			.map(res=> res.json());
	}
}