unit Unit1;    interface    uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls, Grids, DBGrids, Db, ADODB;    type
  THackDBGrid = class(TDBGrid);      TForm1 = class(TForm)
    ADOConnection1: TADOConnection;
    ADOTable1: TADOTable;
    DataSource1: TDataSource;
    DBGrid1: TDBGrid;
    Button1: TButton;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;    var
  Form1: TForm1;    implementation    {$R *.DFM}    procedure TForm1.Button1Click(Sender: TObject);
var
  ColCount: Integer;
begin
  ColCount := THackDBGrid(DBGrid1).VisibleColCount;
  ShowMessage('visible cols = '   IntToStr(ColCount));
end;    end.