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    <p>I was able to get this working. But I set things up a wee bit differently.</p> <ol> <li>I created a ViewModel to act as a contract with the View.</li> <li>I bound to the ComboBox.SelectedItem Property instead of ComboBox.SelectedValue Property</li> </ol> <p>Since I didn't know what your data source was I made up my own to simulate the basic problem: having a comboBox bind correctly within a WPF DataGrid.</p> <p>Here is the composition of my View Model:</p> <pre><code>public class RootViewModel { public List&lt;State&gt; USStates { get; set; } public List&lt;Customer&gt; Customers { get; set; } public ViewModel() { Customers = new List&lt;Customer&gt;(); Customers.Add(new Customer() { FirstName = "John", LastName = "Smith", State = new State() { ShortName = "IL" } }); Customers.Add(new Customer() { FirstName = "John", LastName = "Doe", State = new State() { ShortName = "OH" } }); Customers.Add(new Customer() { FirstName = "Sally", LastName = "Smith", State = new State() { ShortName = "IN" } }); USStates = new List&lt;State&gt;(); USStates.Add(new State() { ShortName = "OH" }); USStates.Add(new State() { ShortName = "IL" }); USStates.Add(new State() { ShortName = "IN" }); } } public class Customer { public string FirstName { get; set; } public string LastName { get; set; } public State State { get; set; } } public class State { public string ShortName { get; set; } public State() { ShortName = string.Empty; } public override bool Equals(object obj) { if (obj is State) { State otherState = obj as State; return ShortName.Equals(otherState.ShortName); } else { return false; } } } </code></pre> <p>Before we begin, I set the DataContext of my Window to be an instance of my properly constructed RootViewModel.</p> <pre><code>&lt;tk:DataGrid ItemsSource="{Binding Customers}" AutoGenerateColumns="False"&gt; &lt;tk:DataGrid.Columns&gt; &lt;tk:DataGridTemplateColumn Header="State"&gt; &lt;tk:DataGridTemplateColumn.CellTemplate&gt; &lt;DataTemplate&gt; &lt;TextBlock Text="{Binding Path=State.ShortName, Mode=TwoWay}" /&gt; &lt;/DataTemplate&gt; &lt;/tk:DataGridTemplateColumn.CellTemplate&gt; &lt;tk:DataGridTemplateColumn.CellEditingTemplate&gt; &lt;DataTemplate&gt; &lt;ComboBox x:Name="cboDonationPurpose" SelectedItem="{Binding Path=State, Mode=TwoWay}" ItemsSource="{Binding RelativeSource={RelativeSource AncestorType={x:Type Window},Mode=FindAncestor}, Path=DataContext.USStates}" DisplayMemberPath="ShortName" SelectedValuePath="ShortName" /&gt; &lt;/DataTemplate&gt; &lt;/tk:DataGridTemplateColumn.CellEditingTemplate&gt; &lt;/tk:DataGridTemplateColumn&gt; &lt;/tk:DataGrid.Columns&gt; &lt;/tk:DataGrid&gt; </code></pre> <p>In order for the SelectedItem to bind properly I need to ensure that I have overriden the Equals method on my entity since under the hood, WPF is using this method to determine who is the SelectedItem or not. I think this was fundamentally your problem from the beginning which caused you to try to bind to SelectedValue instead of SelectedItem.</p>
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