wpf listcollectionview grouping by multiple columns

public class MyClass
{
  public string ItemName { get; set; }
  public string ItemType { get; set; }
  public string ItemGroup { get; set; }
}

var myView = new CollectionViewSource {Source = myCollection}.View;
myView.GroupDescriptions.Add(new PropertyGroupDescription("ItemGroup"));
myView.SortDescriptions.Add(new SortDescription("ItemType", ListSortDirection.Ascending));
myView.SortDescriptions.Add(new SortDescription("ItemName", ListSortDirection.Ascending));