JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://cdn.kendostatic.com/2014.1.226/js/kendo.all.min.js"></script>
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.1.226/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2014.1.226/styles/kendo.silver.min.css">
<div id="grid"></div>

JavaScript

var items = [];
for (var i = 0; i < 80; i++) {
    items[i] = {
        name: "john " + i,
        age: 20 + i % 2
    }
}

var ds = new kendo.data.DataSource({
    data: items,
    pageSize: 100,
    group: {
        field: "age"
    }
});


$("#grid").kendoGrid({
    columns: [{
        field: "name"
    }, {
        field: "age"
    }],
    dataSource: ds,
    groupable: true,
    dataBound: function (o) {
        var g = $("#grid").data("kendoGrid");
        for (var i = 0; i < g.columns.length; i++) {
            g.showColumn(i);
        }
        $("div.k-group-indicator").each(function (i, v) {
            g.hideColumn($(v).data("field"));
        });

    }
});