I suppose I found a bug in datepicker.The scenario to reproduce is quite easy, it can be done on any demo (for example here: http://demos.telerik.com/kendo-ui/datepicker/index) - open a datepicker, navigate to year period selection (2000-2099) and then click left arrow to go to earlier years 1900-1999. At this moment left arrow becomes disabled because that it the earliest date that can be selected. Notice that when you move the mouse pointer away from the arrow the hover effect doesn't disappear. The element still has class k-state-hover. I don't think that is expected behavior, is it?