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function TMeineKlasse.FieldByName(const FieldName: WideString): TField;
begin
  MyField.SetFieldType(ftString);
  MyField.AsString := 'Hallo';
  Result           := MyField;
end;					

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Type
  TMeineKlasse= class(TPanel)
  private
    MyField :TField;
  protected
  public
    function FieldByName(const FieldName: WideString): TField;
  published
  end;



constructor TMeineKlasse.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  MyField := TField.Create(Self);
end;




destructor TMeineKlasse.Destroy;
begin
  MyField.Free;
  inherited Destroy;
end;					

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Type
  TMyField = class(TPanel)
  private
    Wert     :Variant;
    FeldName :String;
    procedure SetAsString(const Value: string);
    function GetAsString:string;
  protected
  public
    constructor Create(AOwner: TComponent);
    destructor Destroy; override;
    property AsString: string read GetAsString write SetAsString;
  published
  end;


Type
  TMeineKlasse= class(TPanel)
  private
    MyField :Array of TMyField;
  protected
  public
...





function TMyField.GetAsString:String;
begin
  Result := Wert;
end;





procedure TMyField.SetAsString(const Value: string);
begin
  Wert := Value;
end;