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  TBlockViewer = class(TCustomControl)
  public
    property Document: BlockDocument read FBlockDocument write SetBlockDocument;
    procedure LoadFromTextFile(AFileName: string);
  end;


procedure TBlockViewer.LoadFromTextFile(AFileName: string);
var
  B: BlockDocument;
begin
  FreeAndNil(FBlockDocument);
  B := BlockDocument.Create(nil);
  B.LoadFromTextFile(AFileName);
  Document := B;
end;



  BlockDocument = class(TComponent)
  private
    FRoot: Root;
  public
    procedure LoadFromTextFile(AFileName: string);
    property BlockRoot: Root read FRoot write FRoot;
  end;



procedure BlockDocument.Clear;
begin
  BlockRoot.Free;
  BlockRoot := Root.Create(Self);
end;

procedure BlockDocument.LoadFromTextFile(AFileName: string);
var
  F: TFileStream;
begin
  F := TFileStream.Create(AFileName, fmOpenRead);
  try
    Clear;
    LoadBlockDocument(F, Self);
  finally
    F.Free;
  end;
end;



procedure LoadBlockDocument(Stream: TStream; BlockDocument: TComponent);
var
  StrStream: TStringStream;
  BinStream: TMemoryStream;
begin
  { Load object }
  StrStream := TStringStream.Create('');
  try
    StrStream.CopyFrom(Stream, Stream.Size);
    StrStream.Seek(0, soFromBeginning);
    
    BinStream := TMemoryStream.Create;
    try
      ObjectTextToBinary(StrStream, BinStream);
      BinStream.Seek(0, soFromBeginning);

      BinStream.ReadComponent(BlockDocument);
    finally
      BinStream.Free;
    end;
  finally
    StrStream.Free;
  end;
end;