Hi Michal,

The item will not be marked as selected only while filtering. If the user enters some text in the filter input, but then clears it, the selection will not be changed. Here is a screencast where this could be observed. The described behavior is by design.

I remain at your disposal for any further questions on the matter. 

Regards,
Neli
Progress Telerik

Hello Michael,

The observed behavior is expected. The 'k-state-selected' class will be applied to an item in the DropDownList after the user made a selection or an item is selected using the select method. In case you need to programmatically select an item after filtering I would suggest you use the select method. For example, in the dataBound event handler, you could check the count of the filtered items and select the first one. Below is an example:

dataBound: function(e){          
          if (e.sender.dataSource._view.length > 0 && e.sender.filterInput.val() !== "") {            
               $("#dropdownlist").data('kendoDropDownList').select(0);             
          }
}

Here is the modified Dojo example. 

Let me know in case you have additional questions on the matter.

Regards,
Neli
Progress Telerik