handleBorderColor: String

Sets the border color of handle. Values of handleBorderColor can be specified in “HTML Color Name”, “hex code” or “rgba values”

Default: “#666666”
Examples: “red”, “#A8A8A8”, “rgba(168,168,168)”, … 
var stockChart = new CanvasJS.StockChart("container",
{
 .
 .
 navigator: {
   .
   .
   slider: {
     handleBorderColor: "#A8A8A8"
   },
   .
   .
 },
 .
 . 
});
stockChart.render();
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