My FindFullMatchIndex method returns -1 when an item is not found. Instead of selecting no items and leaving the scroll position where it's at like the default search text behavior; the combobox scrolls the list to the top and selects the first item in the list.
Hi, The observed behavior is an expected one. Actually the item is not selected, but highlighted only. When FindFullMatchIndex returns -1 it is expected the first item to be highlighted - that behavior with the current implementation of the control could not be altered or modified. Please, check the following article from our documentation - it provides some more detailed information about the ComboBoxFilteringBehavior and its behavior: http://docs.telerik.com/devtools/silverlight/controls/radcombobox/features/filteringbehavior Regards, Nasko