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The border configuration options.

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    dataSource: {
        data: [
            { date: "2013/01/01", value: 40 },
            { date: "2013/01/02", value: 42 }
        ]
    },
    series: [{
        field: "value",
        tooltip: {
            border: {
                color: "red",
                width: 2
            }
        }
    }],
    categoryAxis: {
        field: "date"
    }
});
</script>

The color of the border.

Default: "black"

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    dataSource: {
        data: [
            { date: "2013/01/01", value: 40 },
            { date: "2013/01/02", value: 42 }
        ]
    },
    series: [{
        field: "value",
        tooltip: {
            border: {
                color: "blue",
                width: 1
            }
        }
    }],
    categoryAxis: {
        field: "date"
    }
});
</script>

The width of the border.

Default: 0

<div id="stock-chart"></div>
<script>
$("#stock-chart").kendoStockChart({
    dataSource: {
        data: [
            { date: "2013/01/01", value: 40 },
            { date: "2013/01/02", value: 42 }
        ]
    },
    series: [{
        field: "value",
        tooltip: {
            border: {
                color: "green",
                width: 3
            }
        }
    }],
    categoryAxis: {
        field: "date"
    }
});
</script>