title: Change point color on click using ChartJS
body: <p>Currently I'm able to change the color of an individual point (on a line chart) when you click on it but it changes back immediately to previous color, how can I prevent this?</p>
  
  <p>Here's my function:</p>
  
  <pre><code>var options = {
    onClick: function(e){
      var element = this.getElementAtEvent(e);
      if (element.length &gt; 0) {
        element[0]._view.backgroundColor = '#FFF';
        this.update();
      }
  }
  </code></pre>
  
  <p>I found this same issue here <a href="https://github.com/chartjs/Chart.js/issues/2989" rel="noreferrer">https://github.com/chartjs/Chart.js/issues/2989</a> and apparently the guy was able to manage it but I think that code is no longer compatible.</p>
  
  <p>I'm using ChartJS v2.5.0.</p>