In ComboBox If somehow focus is moved to dropdown element (e.g. when user clicks on a header, or on load more items button) then arrow keys and keyboard support won't work anymore. It can be fixed by simply setting dropdown tabindex to say 1 and attaching ComboBox's own _onKeyDown handler to dropdown keydown too.
Well I suppose that's why they provide the source code upon purchase, you won't believe how much bug fixes we've done on the original source code after using it in our product. If you use Telerik in large scale you will NEED the source code and will HAVE to fix eventual bugs you find by yourself.
That's idiotic. Why should we have to just _know_ lines of stock code that we'd have to put as boilerplate every single time, when this is how the control should function by default?
This case should be handled by implementing the OnClientItemsRequested event. E.g: function OnClientItemsRequested(sender, args) { $telerik.$(sender.get_inputDomElement()).focus(); }