<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        Title="MainWindow" Height="350" Width="525">
    <Grid x:Name="LayoutRoot">
        <telerik:RadGridView x:Name="radGridView"
                             AutoGenerateColumns="False">
            <telerik:RadGridView.Columns>
                <telerik:GridViewComboBoxColumn DataMemberBinding="{Binding ContinentCode, Mode=TwoWay}"
                                                Header="Continent"
                                                DisplayMemberPath="Name"
                                                SelectedValueMemberPath="Code" />
                <telerik:GridViewComboBoxColumn ItemsSourceBinding="{Binding AvailableCountries}"
                                                DataMemberBinding="{Binding CountryID}"
                                                Header="Country"
                                                DisplayMemberPath="Name"
                                                IsReadOnlyBinding="{Binding IsReadOnly}"
                                                SelectedValueMemberPath="ID" 
                                                Width="400" />
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
    </Grid>
</Window>
