The best way to achieve this is to use collection of objects for ItemsSource of your RadComboBox. After that you can use DisplayMemberPath property to select which of the property of the object to be shown to the user. In this scenario the SelectedItem will be your object. You can also use SelectedValuePath property to indicate which of object's properties will be used as SelectedValue of the combo.
I'm sending you a sample project demonstrating this approach. Please check it and inform us in case you have any problems or concerns.
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