/// <summary>
/// Sets our group to a new instance of a
/// CollectionViewGroupRoot being passed in
/// and resets the index.
/// </summary>
/// <param name="group">CollectionViewGroupRoot used to compare on</param>
internal void ResetGroup(CollectionViewGroupRoot group)
{
_group = group;
_index = 0;
}
/// <summary>
/// Constructor for the CollectionViewGroupComparer that takes
/// in an CollectionViewGroupRoot.
/// </summary>
/// <param name="group">CollectionViewGroupRoot used to compare on</param>
internal CollectionViewGroupComparer(CollectionViewGroupRoot group)
{
ResetGroup(group);
}