A recent update added the Checkbox widget that uses a novel set of CSS and HTML elements to stylize the checkbox in the browser.  This style is not automatically applied to the TreeView widget's checkboxes.

It would be very nice to have the TreeView checkboxes stylized to maintain a consistent look and feel across widgets:

http://docs.telerik.com/kendo-ui/web/appearance-styling#checkboxes-and-radio-buttons