Overview
In order to display items, you have to populate the RadComboBox control with some data. You can do this in two ways:
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Manually, by adding items to the Items collection.
With data binding, by using the ItemsSource property.
In this section you will find:
Populating RadComboBox declaratively - explains how to populate your RadComboBox control with some static data in XAML.
Populating RadComboBox in the code-behind - explains how to populate your RadComboBox control with some static data in the code-behind.
DataBinding Support Overview - here you will find information about the supported data sources and RadComboBox's data binding basics.
Binding to Object - explains how to bind your RadComboBox to a collection of objects.
Binding to WCF Service - explains how to bind your RadComboBox to data provided by WCF services.
Binding to ADO.NET Data Service - explains how to bind your RadComboBox to data provided by ADO.NET data services.
Binding to XML - explains how to bind your RadComboBox to xml data.
Using SelectionBoxTemplate - you could define a separate template for the selected item using the SelectionBoxTemplate property.