rad grid column wpf telerik enum

// Step 1 (Enum)
public enum Position 
{ 
    [Display(Name = "Goalkeeper", ShortName = "Goalie")] 
    [Description("The player responsible for protecting his team's goal.")] 
    GK = 0, 
    DF = 1, 
    MF = 2, 
    FW = 3 
} 

// Step 2 (ViewModel)
IEnumerable<Telerik.Windows.Data.EnumMemberViewModel> positions; 
public IEnumerable<Telerik.Windows.Data.EnumMemberViewModel> Positions 
{ 
    get 
    { 
        if (positions == null) 
        { 
            positions = Telerik.Windows.Data.EnumDataSource.FromType<Position>(); 
        } 
 
        return positions; 
    } 
} 

// Step 3 (XAML)
<telerik:GridViewComboBoxColumn DataMemberBinding="{Binding Position}" 
                                ItemsSource="{Binding Positions, Source={StaticResource MyViewModel}}" 
                                DisplayMemberPath="DisplayName" 
                                SelectedValueMemberPath="Value" />