ICollectionView CurrentItem lost when IsLiveGrouping = True

With the new LiveShaping features of WPF 4.5, I am trying to implement LiveGrouping in one of my WPF windows.

However, I have found that if a user edits the property on which the list is grouped, the list item is regrouped, and its focus is lost. The user then has to reselect the item to make any additional changes.

Is there a way to keep the CurrentItem focused after the list has been regrouped?

Consider the following simple scenario, a simple ListBox with ItemsSource property bound to a CollectionViewSource Resource. There are two TextBoxes that allow the user to edit the properties of the class:

public class Word
	{
		public char FirstLetter { get; set; }
		public string FullWord { get; set; }
	}

The StaticResource

<CollectionViewSource  x:Key="wordsCollection" 
                               Source="{Binding Words}" 
                               IsLiveGroupingRequested="True" 
                               IsLiveSortingRequested="True"><CollectionViewSource.SortDescriptions><scm:SortDescription PropertyName="FullWord"/></CollectionViewSource.SortDescriptions><CollectionViewSource.GroupDescriptions><PropertyGroupDescription PropertyName="FirstLetter" /></CollectionViewSource.GroupDescriptions><CollectionViewSource.LiveSortingProperties><System:String>FullWord</System:String></CollectionViewSource.LiveSortingProperties><CollectionViewSource.LiveGroupingProperties><System:String>FirstLetter</System:String></CollectionViewSource.LiveGroupingProperties></CollectionViewSource>

And the controls that use the collection:

<StackPanel><TextBox Text="{Binding FirstLetter, Source={StaticResource wordsCollection}}"/><TextBox Text="{Binding FullWord}"/><ListBox ItemsSource="{Binding Source={StaticResource wordsCollection}}" 
                 DisplayMemberPath="FullWord" Grid.Row="1"><ListBox.GroupStyle><x:Static Member="GroupStyle.Default"/></ListBox.GroupStyle></ListBox></StackPanel>