title: ionic 3 Inject NavController/Tabs into app.component.ts or tabs.ts
body: <p>When i try to use Tabs module i get error:</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>import { IonicPage, NavController, NavParams, Nav, App, MenuController, Tabs } from 'ionic-angular';
  @Component({
    templateUrl: 'tabs.html'
  })
  export class TabsPage {
  
    tab1Root = HomePage;
    tab2Root = AboutPage;
    tab3Root = ContactPage;
  
    tabbar: any;
    constructor(private appGlobal:AppGlobal, tabs:Tabs) {
    //Error: Uncaught (in promise): Error: No provider for Tabs!
      console.log('tabs ', tabs); // namely need to get current tab instance
    }</code></pre>
  </div>
  </div>
  
  namely I need to get current tab instance.
  NavController gives same error
  app.component.ts gives same error
  Help please</p>