protected bool Equals(GroupedPropertyDescriptor other)
 {
     return(base.Equals(other) &&
            Equals(DisplayColumn, other.DisplayColumn) &&
            Equals(OuterPivotKey, other.OuterPivotKey) &&
            Equals(InnerPivotKey, other.InnerPivotKey));
 }
 protected bool Equals(GroupedPropertyDescriptor other)
 {
     return base.Equals(other)
         && Equals(DisplayColumn, other.DisplayColumn)
         && Equals(OuterPivotKey, other.OuterPivotKey)
         && Equals(InnerPivotKey, other.InnerPivotKey);
 }