title: Uncaught TypeError: this.handleSearchNext is not a function
body: <p>I am attempting to override a keyEvent for a handsontable.
  The code runs but will get the error 
  "Uncaught TypeError: this.handleSearchNext is not a function"
  But it is a function defined, so I'm not sure why I am getting this error.</p>
  
  <pre><code>async componentWillReceiveProps(newProps) {
      this.hotTable.updateSettings({
        afterDocumentKeyDown(e) {
          if (e.key === 'Enter') {
            this.handleSearchNext(e)
            e.stopPropagation()
            console.log('Stopped propigation in table', e)
          }
        }
      })
  }
  .
  .
  .
  handleSearchNext = (e) =&gt; {...}
  </code></pre>