<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"
        xmlns:my="clr-namespace:ComboboxColumn"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <my:MyViewModel x:Key="MyViewModel"/>
    </Window.Resources>
    <Grid DataContext="{StaticResource MyViewModel}">
        <telerik:RadGridView Grid.Row="0" 
                             Name="pilotsGrid" 
                             ItemsSource="{Binding Pilots}"
                             AutoGenerateColumns="False"
                             Margin="5">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding FirstName}"/>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding LastName}"/>
                <telerik:GridViewComboBoxColumn DataMemberBinding="{Binding CountryId}"
                                                UniqueName="Country"
                                                SelectedValueMemberPath="Id"
                                                DisplayMemberPath="Name" />
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
    </Grid>
</Window>
