title: Custom builded table (header grouping), editing. Handsontable
body: <p>I've created a table with header groups and I completed the table with data this <a href="http://tinyurl.com/pq3nv6n" rel="nofollow">data</a>. Problem is with the editing. When I'm clicking on some price cell in table, I get error in Chrome console</p>
  
  <blockquote>
    <p>Uncaught TypeError: Cannot read property 'contains' of undefined</p>
  </blockquote>
  
  <p>Can someone help me to solve this problem? How can I edit the prices?</p>