title: why paginator's page's index doesn't change after changing in code?
body: <p>hy, I have paginator:</p>
  
  <pre><code>                   &lt;md-paginator [length]="length"
                                    [pageSize]="pageSize"
                                    [pageSizeOptions]="pageSizeOptions"
                                    (page)="pageEvent = $event"&gt;
                      &lt;/md-paginator&gt;
  </code></pre>
  
  <p>Paginator works only using UI buttons, but I cannot change page's index without reloading the page in code. Nothing of the following works (<code>mdPaginator</code> is in the constructor):</p>
  
  <pre><code>this.pageIndex = 0;
  this.mdPaginator.pageIndex = 0;
  this.mdPaginator.previousPage();
  </code></pre>
  
  <p>By the way, I use paginator in <code>*ngFor</code> cycle, not table.</p>