highcharts - Shared tooltip with multiple stacks -

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i've implemented stacked column chart 4 series divided on 2 stacks. want create tooltip each stack shows info series belong stack. when use shared: true option tooltip formatter function, series in $.each(this.points, function(i, point) {}) loop.

how can create tooltip each stack, while still having access series in stack?

any advice appreciated.

you can use formatter , loop data y value.

http://jsfiddle.net/3utat/10/

tooltip: {         formatter: function () {             var indexs = this.series.index,                 indexp = this.point.x,                 series = this.series.chart.series,                 out = 'y1:' + this.y + '<br/>';              switch (indexs) {                 case 0:                     out += 'y2: ' + series[1].data[indexp].y;                     break;                 case 1:                      out += 'y2: ' +series[0].data[indexp].y;                     break;                 case 2:                      out += 'y2: ' +series[3].data[indexp].y;                     break;                 case 3:                      out += 'y2: ' + series[2].data[indexp].y;                     break;             }              return out;         }         },

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