GridView loses SelectedIndex value when ItemsSource is refreshed - wpf

Question

Microsoft I think this may be a bug. Have a ListView GridView to display a single record.
Naturally the down arrow key navigates through the ListViewItems. That is the behavior I expect. In XAML the ItemsSource and SelectedIndex is bound. The behavior I want is the right and left arrow keys to navigate to the next and prior record.
The way I achieved this is to handle ListView PreviewKeyDown Event. The problem I had is the SelectedIndex is reset to -1 when the ItemSource is refreshed and I want it to stay on the old SelectedIndex. So I had to manually reset the SelectedIndex as shown below.
Here is my problem: After AND ONLY DIRECTLY AFTER a left arrow or right arrow key the up and down keys do not pass the correct value for SelectedIndex.
For example SelectedIndex = 4 then right arrow and then down key the value passed to SelectedIndex is 0 and the value passed should be 4. The ListView is visually on SelectedIndex 4 so it is like it knows the SelectedIndex is 4 but it also does not know. If I do not change the ItemsSource the up and down arrow keys work correctly. I tried KeyDown and KeyUp events but in the case those events just don't fire at all in the fail condition described above.
WPF 4.0 Visual Studio 2010.
private void lvCurDocFields_PreviewKeyDown(object sender, KeyEventArgs e)
{
Debug.WriteLine("lvCurDocFields_PreviewKeyDown " + e.Key.ToString());
e.Handled = false;
Int32 lastIndex;
switch (e.Key) // e.KeyCode
{
case Key.Right:
lastIndex = lvCurDocFields.SelectedIndex;
App.StaticGabeLib.Search.SelectedDocIndex++;
if (lvCurDocFields.SelectedIndex != lastIndex)
{
lvCurDocFields.SelectedIndex = lastIndex;
}
e.Handled = true;
break;
case Key.Left:
lastIndex = lvCurDocFields.SelectedIndex;
App.StaticGabeLib.Search.SelectedDocIndex--;
if (lvCurDocFields.SelectedIndex != lastIndex)
{
lvCurDocFields.SelectedIndex = lastIndex;
}
e.Handled = true;
break;
}
base.OnPreviewKeyDown(e);
}

Answer 1

Normally, I store a reference to the item that was selected, update the list, and re-select it afterwards. ListIndex isn't a reliable way to maintain a selection if things are inserted or deleted from the list.
if(MyListControl.Items.Contains(PreviouslySelectedItem)) MyListControl.SelectedItem = PreviouslySelectedItem;