Overview
In order to display items in RadAutoCompleteBox, you have to populate the control with some data. You can achieve this by using the ItemsSource property.
The Populating with Data is part of Telerik UI for WPF, a
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You cannot add items declaratively in RadAutoCompleteBox control.
In this section you will find:
Binding to Object – how to bind your RadAutoCompleteBox to a collection of objects.
DataBinding Support – detailed information about the supported data sources and RadAutoCompleteBox’s binding basics.