Strange ListBox scrolling (random empty lines inserted at ends)

[molbal]

Hello,
I have a really strange issue with a ListBox scrolling. When scrolling fast, or more times random entries are being inserted at the ends of the list. I have tried to set the virtualization mode to recylcing (to enable cache). I have taken a video of the error: http://www.youtube.com/watch?v=qSRi30P3loM

Here is the XAML Code:

<ListBox VirtualizingStackPanel.VirtualizationMode="Recycling" Height="573" HorizontalAlignment="Left" Name="listBox" VerticalAlignment="Top" Width="456" DataContext="{Binding}" ItemsSource="{Binding}" Margin="0,-22,0,0" Grid.ColumnSpan="2">
                <ListBox.ItemTemplate>
                    <DataTemplate>
                        <Grid>
                            <TextBlock Text="{Binding Name}" FontSize="38" />
                            <TextBlock Text="{Binding Group}" FontSize="22" Margin="10,42,-10,-30" />
                        </Grid>
                    </DataTemplate>
                </ListBox.ItemTemplate>
            </ListBox>

Here is the C# part where I fill the list:

            byte[] xmlByteArray = Encoding.UTF8.GetBytes(xml);
            MemoryStream xmlStream = new MemoryStream(xmlByteArray);
            XDocument loadedData;
            if (xmlStream != null)
            {
                loadedData = XDocument.Load(xmlStream);

            }
            else
            {
                MessageBox.Show("Something went wrong, sorry");
                return 0;
            }
            var data = from query in loadedData.Descendants()
                       select new EwalletList
                       {
                           Name = DecodeFrom64((string)query.Element("name")),
                           Value = DecodeFrom64((string)query.Element("value")),
                           Group = DecodeFrom64((string)query.Element("group"))

                       };
            listBox.ItemsSource = data;
            return 1;

DecodeFrom64 is a string to string function where I decode a base64 encoded string.

I would appreciate any help,
Thanks,
Bálint

[wizard_hu_]

Side ideas: does it also happen in the emulator? Can it happen that a software update cures the problem?

[molbal]

Side ideas: does it also happen in the emulator? Can it happen that a software update cures the problem?

Well, I changed nothing but the problem is resolved. (Im emutator, too). I cannot reproduce the problem any more, neither in emulator or on-device. Miracles!

[chintandave_er]

Then It should be some kind of bug in listbox control (from Microsoft).

[joaocardoso]

Then It should be some kind of bug in listbox control (from Microsoft).

If you get to replicate the issue again I would recommend filling a bug report on connect at Microsoft. If you can include a project sample.