title: How to export a graphic AmCharts from an external button?
body: <p>Currently there is an export button inside the graph, is an option AmCharts default, but I need to do it from an external button. </p>
  
  <p>example: `exportConfig: {
                      menuTop: "21px",
                      menuBottom: "auto",
                      menuRight: "21px",
                      backgroundColor: "#efefef",</p>
  
  <pre><code>                menuItemStyle   : {
                  backgroundColor         : '#EFEFEF',
                  rollOverBackgroundColor : '#DDDDDD'},
  
                  menuItems: [{
                      textAlign: 'center',
                      icon: 'http://www.amcharts.com/lib/3/images/export.png',
                      onclick:function(){},
                      items: [{
                          title: 'JPG',
                          format: 'jpg'
                      }, {
                          title: 'PNG',
                          format: 'png'
                      }, {
                          title: 'SVG',
                          format: 'svg'
                      }]
                  }]
              }
          });`
  </code></pre>
  
  <p><a href="http://jsfiddle.net/BGuuT/" rel="nofollow">http://jsfiddle.net/BGuuT/</a> </p>
  
  <p>I need the function to export a button click within the page but off the chart.</p>