title: Angular 2 Material: sidenav focus on the first navigation item
body: <p>I am using <a href="https://material.angular.io/" rel="noreferrer">Angular 2 Material</a> and I have an issue with my navigation inside a sidenav component. Every time when I open the sidenav it automatically sets focus to the first <code>md-button</code> item and doesn't disappear until I click somewhere on the screen.</p>
  
  <p>This is an example: <a href="https://plnkr.co/edit/pNv9Bx4o1qQSF2bpOqyM?p=preview" rel="noreferrer">https://plnkr.co/edit/pNv9Bx4o1qQSF2bpOqyM?p=preview</a></p>
  
  <p>I tried to set <code>focus()</code> to another element on <code>sidenav.open()</code> event but a blinking effect appears for a second. </p>
  
  <p>Is there any option or property that can disable this initial focus to the first menu item?</p>