title: ion-fab-list on open, on close event
body: <p>Hi I hope you can help me with this.</p>
  
  <p>I´m using ionic 2 and I want to have control on the ion-fab this is the HTML structure:</p>
  
  <pre><code>&lt;ion-fab left bottom&gt;
    &lt;button ion-fab mini&gt;
      &lt;ion-icon name="add"&gt;&lt;/ion-icon&gt;
    &lt;/button&gt;
    &lt;ion-fab-list side="top"&gt;
      &lt;button ion-fab (tap)="changeMap('SATELLITE')"&gt;
        &lt;ion-icon name="map"&gt;&lt;/ion-icon&gt;
        &lt;div class="label-map"&gt;Satellite&lt;/div&gt;
      &lt;/button&gt;
      &lt;button ion-fab (tap)="changeMap('HYBRID')"&gt;
        &lt;ion-icon name="map-map"&gt;&lt;/ion-icon&gt;
        &lt;div class="label-map"&gt;Hybrid&lt;/div&gt;
      &lt;/button&gt;
      &lt;button ion-fab (tap)="changeMap('NONE')"&gt;
        &lt;ion-icon name="map-map"&gt; &lt;/ion-icon&gt;
        &lt;div class="label-map"&gt;None&lt;/div&gt;
      &lt;/button&gt;
    &lt;/ion-fab-list&gt;
  &lt;/ion-fab&gt;
  </code></pre>
  
  <p>What I want is to know when is the ion-fab-list opened and closed.</p>