Chart.types.Pie.extend({
                name: "PieUnique",
                addData: function (segment, atIndex, silent) {
                    var index = atIndex || this.segments.length;
                    this.segments.splice(index, 0, new this.SegmentArc({
                        value: segment.value,
                        outerRadius: (this.options.animateScale) ? 0 : this.outerRadius,
                        innerRadius: (this.options.animateScale) ? 0 : (this.outerRadius / 100) * this.options.percentageInnerCutout,
                        fillColor: segment.color,
                        highlightColor: segment.highlight || segment.color,
                        showStroke: this.options.segmentShowStroke,
                        strokeWidth: this.options.segmentStrokeWidth,
                        strokeColor: this.options.segmentStrokeColor,
                        startAngle: Math.PI * this.options.startAngle,
                        circumference: (this.options.animateRotate) ? 0 : this.calculateCircumference(segment.value),
                        label: segment.label,
                        //add option passed
                        id: segment.id
                    }));
                    if (!silent) {
                        this.reflow();
                        this.update();
                    }
                },
            });

var pieData = [{
                value: 300,
                color: "#F7464A",
                highlight: "#FF5A5E",
                label: "Red",
                id: "1-upi"
            }, {
                value: 50,
                color: "#46BFBD",
                highlight: "#5AD3D1",
                label: "Green",
                id: "2-upi"
            }, {
                value: 100,
                color: "#FDB45C",
                highlight: "#FFC870",
                label: "Yellow",
                id: "3-upi"
            }, {
                value: 40,
                color: "#949FB1",
                highlight: "#A8B3C5",
                label: "Grey",
                id: "4-upi"
            }, {
                value: 120,
                color: "#4D5360",
                highlight: "#616774",
                label: "Dark Grey",
                id: "5-upi"
            }];

var ctx = document.getElementById("chart-area").getContext("2d");
            window.myPie = new Chart(ctx).PieUnique(pieData);

            document.getElementById("chart-area").onclick = function (evt) {
                var activePoints = window.myPie.getSegmentsAtEvent(evt);

                if (activePoints[0]) {
                    var label = activePoints[0].label;
                    var value = activePoints[0].value;
                    var id = activePoints[0].id;

                    alert('label = ' + label + '   |   value = ' + value + '   |   id = ' + id);
                }
            };

I expect to create the same funcionality but in Bar type.