title: Handsontable: setDataAtCell on the trigger of an event
body: <p>I am new to handsontable library of Javascript and hence apologize if the question seems too basic.</p>
  <p>What I am trying to do is that if someone writes /changes the data written in the first row of the table, the value in the cell at column 5 and row 5 should be set to &quot;changed&quot;. I know that to set a value I would need to use <code>hot.setDataAtCell(5,5,&quot;changed&quot;)</code>. What I don't know is how to trigger this command i.e. I need to find a way to identify when any cell in the first row of a column has been changed. I have tried overriding the <code>afterChange</code> callback, but the code keeps on hanging.</p>