Set Text Wrapping for an AutoGenerated DataGrid TextBox using a behavior

Question

I am attempting to set an auto-generated DataGrid column's TextBox to wrap text using a behavior. However, setting the property during the AutoGeneratingColumn event does not work. Am I setting the correct property or is there some problem?

Here is the XAML for the DataGrid:

<DataGrid x:Name="TableGrid" ItemsSource="{Binding GridData}" AutoGenerateColumns="True">
   <i:Interaction.Behaviors>
      <b:AutoHeaderBehavior/>
   </i:Interaction.Behaviors>
</DataGrid>

And here is the code for the behavior:

public class AutoHeaderBehavior : Behavior<DataGrid>
{
   protected override void OnAttached()
   {
      base.OnAttached();
      this.AssociatedObject.AutoGeneratingColumn += OnGeneratingColumn;
   }

   protected override void OnDetaching()
   {
      this.AssociatedObject.AutoGeneratingColumn -= OnGeneratingColumn;
      base.OnDetaching();
   }

   private void OnGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
   {
      if (e.PropertyDescriptor is PropertyDescriptor descriptor)
      {
         e.Column.Header = descriptor.DisplayName ?? descriptor.Name;
         if (descriptor.DisplayName == "Description")
         {
            var wrapping = new Setter() { Property = TextBox.TextWrappingProperty, Value = TextWrapping.Wrap };
            var style = new Style(typeof(TextBox));
            style.Setters.Add(wrapping);
            (e.Column as DataGridTextColumn).ElementStyle = style;
            e.Column.Width = 300;
         }
      }
      else
         e.Cancel = true;
   }
}

Answer 1

Well, after fiddling around with this problem for several hours I decided to resolve the issue by replacing the column entirely.

private void OnGeneratingColumn(object sender, DataGridAutoGeneratingColumnEventArgs e)
{
    if (e.PropertyDescriptor is PropertyDescriptor descriptor)
    {
        e.Column.Header = descriptor.DisplayName ?? descriptor.Name;
        if (descriptor.DisplayName == "Description")
        {
            var column = new DataGridTemplateColumn();
            var element = new FrameworkElementFactory(typeof(TextBlock));
            var binding = new Binding("Description");
            var template = new DataTemplate();

            element.SetBinding(TextBlock.TextProperty, binding);
            element.SetValue(TextBox.TextWrappingProperty, TextWrapping.Wrap);
            template.VisualTree = element;
            template.Seal();
            column.CellTemplate = template;
            column.Header = e.Column.Header;
            column.Width = 300;
                
            e.Column = column;
        }
    }
    else
        e.Cancel = true;
}