[Solved]-Draw custom bars in a Highcharts bar chart-Highcharts

You can also do this.

Include the following plugin.

plotOptions:{ series: { borderRadiusTopLeft: 5, borderRadiusTopRight: 5
} }

Unfortunately this opption is not avaiable in highcharts, but you can request your suggestions in our uservoice system http://highcharts.uservoice.com

Unless I am missing something, you don't need to over ride any rendering:

http://jsfiddle.net/jlbriggs/nHGRr/3/

plotOptions:{
        series: {
            borderRadius:10      
        }
    },