title: How to call component method from service? (angular2)
body: <p>I want to create service, which can interact with one component.
  All another components in my app, should be able to call this service, and this service should interact with this component.</p>
  
  <p>How to call component method from service?</p>
  
  <pre><code>@Component({
    selector:'component'
  })
  export class Component{
  
    function2(){ 
      // How call it?
    }
  }
  </code></pre>
  
  <p>From this servive?</p>
  
  <pre><code>@Injectable()
  
  export class Service {
  
  
    callComponentsMethod() {
      //From this place?;
        }
  }
  </code></pre>