wpf listcollectionview grouping by multiple columns. Only view

public static void GroupBy(this ListCollectionView lcv, params string[] properties)
{
    if (lcv == null)
        return;
    if (lcv.GroupDescriptions != null)
        lcv.GroupDescriptions.Clear();
    if (properties != null && properties.Length > 0)
    {
        foreach (string p in properties)
        {
            PropertyGroupDescription groupDescription = new PropertyGroupDescription(p);
            lcv.GroupDescriptions.Add(groupDescription);
        }
    }
    else
    {
        lcv.IsLiveGrouping = false;
    }
}