update

src/app/nav.component.ts

@@ -13,7 +13,7 @@ import {Logger} from 'angular2-logger/core';
 // declare var layer: any;
 
 
-import {AppService, DataStore} from './app.service';
+import {AppService, DataStore, User} from './app.service';
 
 
 //noinspection TypeScriptValidateTypes
@@ -26,6 +26,7 @@ import {AppService, DataStore} from './app.service';
 
 export class NavComponent {
   DataStore = DataStore;
+  User = User;
 
   constructor(private _appService: AppService,
               private _logger: Logger) {

src/app/nav.html

-<nav class="navbar navbar-toggleable-md fixed-top navbar-inverse bg-inverse" *ngIf="DataStore.logined">
+<nav class="navbar navbar-toggleable-md fixed-top navbar-inverse bg-inverse" *ngIf="User.logined">
       <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
         <span class="navbar-toggler-icon"></span>
       </button>