Hello, I have found a bug in combox control. I will try to describe it. I use combobox with loadondemand feature enabled. For now everything works perfect but today I accidentally typed one of special characters ( or ) or ! Then combobox stops responding. I have debugged code and it seems that OnItemsRequested="cmb_miesto_nalozenia_ItemsRequested" repeatedly do routine. Also in the SQL profiler there is the same sql command repeatedly run. Last telerik version in which everything worked properly was 2016.1.113.40. This bug was tested in last public and also in internal build version: Version 2016.3.1027 / 2016.3.1303. Please give me info what to do... If there is some workaround for now... Best regards Vasssek