Stream im Object als publisched property

[Taladan]

Hallo.
Ich möchte gern einen Stream als publisched property deklarieren. Doch irgendwie sagt mir Delphi immer incompatible Typen...

Delphi-Quellcode:

  TName = class(TBaseObject)
   private
    fStream : TStream;
    procedure SetStream(aStream : TStream);
    function GetStream(aStream:TStream):TStream;
   public
    constructor Create;
   published
    property Stream : TStream read GetStream write SetStream;
   end;

procedure TName.SetStream(aStream : TStream);
begin
  fStream := aStream;
end;

function TName.GetStream(aStream:TStream):TStream;
begin
  result := fStream;
end;

constructor TName.Create;
begin
  inherited;
  fStream := TStream.Create;
end;