title: How to have an Input box in an md-menu item
body: <p>I want to have an option to add an item to existing list or create a new one; similar to youtube's 'Add to playlist'. The following kind of works but the menu goes away once there is focus on the input box. Is there a way to disable closing of menu on click of one item in the menu?</p>
  
  <p>Environment is Angular 2 / material 2.</p>
  
  <pre><code>    &lt;button md-raised-button  [mdMenuTriggerFor]="menu"&gt;Add To&lt;/button&gt;
      &lt;md-menu #menu="mdMenu"&gt;
        &lt;button md-menu-item&gt;Item 1&lt;/button&gt;
        &lt;button md-menu-item&gt;Item 2&lt;/button&gt;
        &lt;md-input-container class="mx-4"&gt;
          &lt;input mdInput placeholder="Create new" value=""&gt;
        &lt;/md-input-container&gt;
      &lt;/md-menu&gt;
  </code></pre>