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copied!<p>One thing that seems to be wrong is you should probably be using SelectedValueBinding not SelectedItemBinding. </p> <p>Here's a sample that works ok for me:</p> <pre><code><Page.Resources> <ViewModel:DataGridComboBoxViewModel x:Key="model"/> <Style x:Key="ElementStyle" TargetType="ComboBox"> <Setter Property="ItemsControl.ItemsSource" Value="{Binding Path=DataContext.DetailItems, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type DataGrid}}}" /> </Style> </Page.Resources> <Grid DataContext="{StaticResource model}"> <DataGrid ItemsSource="{Binding Items}" AutoGenerateColumns="False"> <DataGrid.Columns> <DataGridTextColumn Header="Id" Binding="{Binding Id}"/> <DataGridTextColumn Header="Name" Binding="{Binding Name}"/> <DataGridComboBoxColumn Header="Combo" DisplayMemberPath="Name" SelectedValueBinding="{Binding DetailItem}" ElementStyle="{StaticResource ElementStyle}" EditingElementStyle="{StaticResource ElementStyle}" > </DataGridComboBoxColumn> </DataGrid.Columns> </DataGrid> </Grid> public class DataItem : ViewModelBase { public int Id { get; set; } public string Name { get; set; } public string Description { get; set; } private DetailItem _detailItem; public DetailItem DetailItem { get { return _detailItem; } set { Debug.WriteLine(value != null ? string.Format("Setting detail item to: {0}", value.Name) : "Setting detail item to null."); Set(() => DetailItem, ref _detailItem, value); } } } public class DetailItem : ViewModelBase { public int Id { get; set; } public string Name { get; set; } } public class DataGridComboBoxViewModel : ViewModelBase { public DataGridComboBoxViewModel() { DetailItems = new List<DetailItem> { new DetailItem {Id = 0, Name = "Zero"}, new DetailItem {Id = 1, Name = "One"}, new DetailItem {Id = 2, Name = "Two"}, new DetailItem {Id = 3, Name = "Three"}, }; Items = new List<DataItem> { new DataItem {Id = 0, Name = "Item 1", Description = "This is item 1"}, new DataItem {Id = 1, Name = "Item 2", Description = "This is item 2"}, new DataItem {Id = 2, Name = "Item 3", Description = "This is item 3"}, new DataItem {Id = 3, Name = "Item 4", Description = "This is item 4"}, }; } public List<DataItem> Items { get; set; } public List<DetailItem> DetailItems { get; private set; } } </code></pre>

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