title: Hide Angular 2 material tooltip like ngIf
body: <p>In Angular 1 Material I could use a directive, right now it is an attribute, right now it is very hard to do. How can I do it simply to only show the tooltip like when the width of page is small and hide when it is big?</p>
  
  <p>I cannot find. It is not possibly to use like:</p>
  
  <pre><code>&lt;md-tooltip ngIf="false"&gt;sometimes hidden&lt;/md-tooltip&gt;
  </code></pre>