public GroupedPropertyDescriptor(string name, PivotKey outerPivotKey, DisplayColumn displayColumn, PivotKey innerPivotKey) : base(name, displayColumn.GetAttributes(MergePivotKeys(outerPivotKey, innerPivotKey)).ToArray()) { OuterPivotKey = outerPivotKey; InnerPivotKey = innerPivotKey; DisplayColumn = displayColumn; }