[HELP] generateLabels , onClick hide dataset

[erkanisuf]

I have datasets with dublicated labels in a stacked bar chart:

{label:"Bagel",data:[1,2,3,4,5]},
{label:"Bagel",data:[3,2,3,3,1]},
{label:"Bread",data:[3,2,3,3,1]},

And i am getting dublicated labels in the legend. So i tried to use generateLabels() callback so i can generate an array of unique labels. But when on click nothing happens, so i tried to use the onClick().
I tried to use like this in the onClick():
this.chart.getDatasetMeta(index).hidden = true
Or
this.chart.getDatasetMeta(index).data[index].hidden = true
and then this.update()
But it doesnt hide the bar and bugs and hides all the generated labels

Would appreciate some help , i have been stuck for very long time.