Incorrect XAML, why?

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Mobile

Silverlight

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Hi everyone, I'm devoliping a simple app,or better, I've developed a simple app, it all works fine, but I don't know why in VS2010 this piece of code is marked as "incorrect XAML" when I open the page on the designer.
I repeat, it all works fine, compile and Deploy, but the designer says there's some errors in XAML

Here's the code, any idea?

<Grid x:Name="LayoutRoot">
        <ListBox Height="499" HorizontalAlignment="Left" Name="lstPeople" VerticalAlignment="Top" Width="480" SelectionChanged="lstPeople_SelectionChanged">
            <ListBox.ItemTemplate>
                <DataTemplate>
                    <StackPanel x:Name="stackPanelPeopleList" Orientation="Vertical" >
                        <TextBlock HorizontalAlignment="Left" Foreground="{StaticResource PhoneForegroundBrush}" FontSize="30" Text="{Binding Nome}"/>
                        <StackPanel Orientation="Horizontal" HorizontalAlignment="Left">
                            <TextBlock Margin="0,0,10,0" FontSize="25" Text="{Binding Path=LocalizedResources.QuotaLabel, Source={StaticResource LocalizedStrings}}" Foreground="LightBlue"/>
                            <TextBlock Margin="0,0,10,0" FontSize="25" Text="{Binding QuotaVersata}" Foreground="{StaticResource PhoneForegroundBrush}"/>
                        </StackPanel>
                    </StackPanel>
                </DataTemplate>
            </ListBox.ItemTemplate>
        </ListBox>        
    </Grid>

The problems appears to be in <datatemplate> tag and all the lines after that...