Fix ListView scrolling

gistfile1.cs

public static class ListViewHelper
{
    #region SetFixedWidthOnItemsPanel

    public static bool GetSetFixedWidthOnItemsPanel(ListView element)
    {
        return (bool)element.GetValue(SetFixedWidthOnItemsPanelProperty);
    }

    public static void SetSetFixedWidthOnItemsPanel(ListView element, bool value)
    {
        element.SetValue(SetFixedWidthOnItemsPanelProperty, value);
    }

    public static readonly DependencyProperty SetFixedWidthOnItemsPanelProperty = DependencyProperty.RegisterAttached(
        "SetFixedWidthOnItemsPanel",
        typeof(bool),
        typeof(ListViewHelper),
        new PropertyMetadata(false, OnSetFixedWidthOnItemsPanelChanged));

    private static void OnSetFixedWidthOnItemsPanelChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
    {
        var element = (ListView)d;
        var oldValue = (bool)e.OldValue;
        var newValue = (bool)e.NewValue;

        if (oldValue)
        {
            element.SizeChanged -= OnListViewSizeChanged;
        }

        if (newValue)
        {
            element.SizeChanged += OnListViewSizeChanged;
        }
    }

    private static void OnListViewSizeChanged(object sender, SizeChangedEventArgs e)
    {
        var listView = (ListView)sender;
        var itemsStackPanel = listView.ItemsPanelRoot as ItemsStackPanel;
        if (itemsStackPanel != null)
        {
            itemsStackPanel.Width = e.NewSize.Width;
        }
    }

    #endregion
}

Hi, I'm curious as to why this bit of code is needed. Is this to resolve the issue where the ListView can kind of scroll a little bit horizontally even though its HorizontalScrollMode has been disabled? (I've noticed this type of problem in my WP (Runtime 8.1) app.) Or is it to resolve an entirely different issue? Thanks!