title: How to mat-button-toggle by default selected in angular
body: <p>How can I set default selected last button in toggle group.<br>
  This is my code.</p>
  
  <pre><code>&lt;mat-button-toggle-group #group="matButtonToggleGroup"&gt;
      &lt;mat-button-toggle value="Heritage"&gt;
          &lt;span&gt;Heritage&lt;/span&gt;
      &lt;/mat-button-toggle&gt;
      &lt;mat-button-toggle value="Nature"&gt;
          &lt;span&gt;Nature&lt;/span&gt;
      &lt;/mat-button-toggle&gt;
      &lt;mat-button-toggle value="People"&gt;
          &lt;span&gt;People&lt;/span&gt;
      &lt;/mat-button-toggle&gt;
      &lt;mat-button-toggle value="All"&gt;
          &lt;span&gt;All&lt;/span&gt;
      &lt;/mat-button-toggle&gt;
  &lt;/mat-button-toggle-group&gt;
  </code></pre>