title: Angular 2 event broadcast
body: <p>New to Angular 2. I'm working on broadcast a event between same level component. Currently I know EventEmitter just can transfer a event to upper level component.</p>
  
  <p>I have checked this <a href="https://stackoverflow.com/questions/32711093/publisher-subscriber-model-in-angular2-or-angular2-to-broadcast-and-emit/32713523#32713523">this link</a> and know observable may be a way to solve my problem, but the sample in that url seems not work for me.</p>
  
  <p>Does anyone know how to use it(observable) for broadcast event or some other way to transfer event to same level components?</p>