For scenarios where you want to search by multiple fields we recommend adding a new property to the data item that combines the values of all properties that have to be searched. Setting telerik:TextSearch.TextPath="the_combined_values_property" will do the trick. However, when an item is selected, this will also display the value of the combined property in the TextBox inside RadComboBox.
All the best,
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items