Обновление цветов в TDBGrid

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, DB, ADODB, StdCtrls, Grids, DBGrids, XPMan;

type
  TCustomDBGridC = class(TCustomDBGrid);
  TForm1 = class(TForm)
    ADOConnection1: TADOConnection;
    ADOQuery1: TADOQuery;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    ADOQuery1id: TAutoIncField;
    ADOQuery1Status: TIntegerField;
    ADOQuery1SimpleText: TWideStringField;
    Button1: TButton;
    XPManifest1: TXPManifest;
    procedure Button1Click(Sender: TObject);
    procedure DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
      DataCol: Integer; Column: TColumn; State: TGridDrawState);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
  i: Integer;
begin
  ADOQuery1.First;
  for i := 0 to ADOQuery1.RecordCount - 1 do begin
    ADOQuery1.Edit;
    ADOQuery1Status.Value:=Random(4);
    ADOQuery1.Next;
  end;
end;

procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
  DataCol: Integer; Column: TColumn; State: TGridDrawState);
begin
  with TCustomDBGridC(Sender) do
    case DataLink.Fields[1].AsInteger of
      1: Canvas.Brush.Color:=clGreen;
      2: Canvas.Brush.Color:=clSkyBlue;
      3: Canvas.Brush.Color:=clSilver;
      4: Canvas.Brush.Color:=clAqua;
    end;
  DBGrid1.DefaultDrawColumnCell(Rect, DataCol, Column, State);
end;

end.