How have you set the binding in the xaml? Normally you would set the ItemsSource in the xaml, and then in your code behind you would set the
DataContext
to the
List<string></string>
something like this
<ComboBox ItemsSource="{Binding}" Name="cbo"/>
and in your code behind
List<string> countries = new List<string>();
cbo.DataContext = countries;
Hope this helps