/// <summary>
/// Encapsulates updating the property group count for this and any parent grouping collections.
/// </summary>
/// <param name="delta"></param>
/// <owner>LukaszG</owner>
internal void ChangePropertyGroupCount(int delta)
{
this.propertyGroupCount += delta;
ErrorUtilities.VerifyThrow(this.propertyGroupCount >= 0, "The property group count should never be negative");
parentGroupingCollection?.ChangePropertyGroupCount(delta);
}
