kendo will be more beautiful if kendo add a scrollbar plugin, and use it in some other widgets(DropDownList, MultiSelect, and so on); and I find something that I think it's not pretty: the grid widgets in metro theme, when I click the head of the grid, the order icon is not display immediately.
The widgets you depicted utilize the browser scrollbar which is automatically styled in accordance with the selected theme. You'll probably concur that there's no real value in adding our own scrollbar to serve the same purpose.