charts: Array

charts is a collection of chart options that allows you to set data and all attributes / properties of Charts to be displayed inside the StockChart. A Chart is created for each chart options object that you add to this array.

var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 charts: [
   {// chart options 1
   },
   {// chart options 2
   }
 }],
 .
 . 
});
stockChart.render();

Please refer to chart options page for more information about the attributes / properties available.