can't ceate TWideStringField with FieldDefs Value?

From: moritenw (moritenw_at_163.net)
Date: 12/24/03 

Date: Wed, 24 Dec 2003 16:27:57 +0800

  Enviroment: Delphi6 + Update2 + WIN2K + RTL P3
  Here is my operation step:
  1. Add a new item into FieldDefs with datatype ftWideString
  2. CreateDataSet

but after this, the Field of Type from this item is TStringField, not
TWideStringField. what's the property i need to set for create a
TWidestringField in TADODataSet. (In the adodb.pas the Twidestring convert
ftWidestring to advChr)?

somebody would like to help me?