groupable.messages.empty String (default: "Drag a column header and drop it here to group by that column")

The text displayed in the grouping drop area.

Example - set the "empty" grouping message

<div id="grid"></div>
<script>
$("#grid").kendoGrid({
  columns: [
    { field: "productName" },
    { field: "category" }
  ],
  dataSource: [
    { productName: "Tea", category: "Beverages" },
    { productName: "Coffee", category: "Beverages" },
    { productName: "Ham", category: "Food" },
    { productName: "Bread", category: "Food" }
  ],
  groupable: {
    messages: {
      empty: "Drop columns here"
    }
  }
});
</script>