title: Codemirror, how to add add-ons
body: <p>I am trying to add the <code>scroll past end</code> add-on for codemirror but I cannot add it to my codemirror instance. </p>
  
  <p>I tried calling it like this <code>scrollPastEnd: true</code> in the options but that didn't work. I also tried using the <code>defineOption</code> function but the console says it is <code>undefined</code>.</p>
  
  <p>Thanks for the help</p>