title: Angular button doesn't work within FormArray
body: <p>I am trying a simple form array a bit like a ToDo list however I am adding a button to each item within the list to allow it to be deleted (though didn't recreate this part within the example).</p>
  
  <p>I am finding that the button for each item is not "clickable". I also noticed that the "ripple" effect doesn't work as it should on those buttons too.</p>
  
  <p>I have managed to create a stackblitz to re-create it so any help would be appreciated</p>
  
  <p><a href="https://stackblitz.com/edit/angular6-material-components-demo-ck2jpe" rel="nofollow noreferrer">https://stackblitz.com/edit/angular6-material-components-demo-ck2jpe</a></p>
  
  <blockquote>
    <p>To use just enter something in to the textbox, click ADD and then try to delete it from the list below where it appeared</p>
  </blockquote>