All Telerik .NET tools and Kendo UI JavaScript components in one package. Now enhanced with:
https://demos.telerik.com/kendo-ui/spreadsheet/custom-editors
cells: [
{ value: "Select item:", bold: true },
{ background: "#fef0cd", validation: { dataType: "list", showButton: true, comparerType: "list", from: '{ "Foo item 1", "Bar item 2", "Baz item 3" }', allowNulls: true, type: "reject"} }]