He hecho el programa sin nada de código para poder ver que estaba pasando: Un dataset, un TTable y un DBgrid.
Código Delphi
[-]
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, Grids, DBGrids, DB, DBTables;
type
TForm1 = class(TForm)
DataSource1: TDataSource;
Table1: TTable;
DBGrid1: TDBGrid;
procedure FormShow(Sender: TObject);
private
public
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormShow(Sender: TObject);
begin
table1.Open;
end;
end.