title: Custom Highcharts Context Menu Button Appearing in Every Chart on Page
body: <p>I have a page with several charts, and I need to be able to add specific options to the exporting context menu for each chart.  This is the code I am using:</p>
  
  <pre><code>myChart.options.exporting.buttons.contextButton.menuItems.push({
          text: "Custom Option",
          onclick: someFunction
      });
  </code></pre>
  
  <p>Unfortunately, this adds the option to every chart, not just the chart myChart references.  I'd like to be able to add an option and have it appear on only one chart.</p>
  
  <p>Here is a fiddle which demonstrates: <a href="http://jsfiddle.net/4uP5y/2/" rel="noreferrer">http://jsfiddle.net/4uP5y/2/</a></p>
  
  <p>Thanks!</p>