<div id="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "name" },
    { field: "age" }
  ],
  dataSource: [
    { name: "Jane Doe", age: 30 },
    { name: "John Doe", age: 33 }
  ],
  toolbar: {
    items: [
      { 
        name: "customDropDown", 
        template: (data) => `<select class="k-dropdown">
                    <option>Option 1</option>
                    <option>Option 2</option>
                    <option>Option 3</option>
                  </select>`
      }
    ]
  }
});
</script>