score:1

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

score:1

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

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

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

score:0

You can also do this.

Include the following plugin.

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


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