SoloCodigo

procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
  DataCol: Integer; Column: TColumn; State: TGridDrawState);
var
Check: Integer;
begin
{ Compruebo antes si la tabla está vacía. }
 if not IBDataset3.IsEmpty then
 begin
{ Campo 1. }
  if CompareText(Column.FieldName, 'nomesp_comp') = 0 then
  begin
    Check := 0;
  if IBDataset3['nomesp_comp'] = '1' then
   Check := DFCS_CHECKED;
   dbGrid1.Canvas.FillRect(Rect);
   DrawFrameControl(dbGrid1.Canvas.Handle, Rect,
   DFC_BUTTON, DFCS_BUTTONCHECK or Check);
  end
else
dbgrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);

{ Campo 2. }
 if CompareText(Column.FieldName, 'item_subcomp') = 0 then
 begin
 Check := 0;
  if IBDataset3['item_subcomp'] = '1' then
   Check := DFCS_CHECKED;
   dbGrid1.Canvas.FillRect(Rect);
   DrawFrameControl(dbGrid1.Canvas.Handle, Rect,
   DFC_BUTTON, DFCS_BUTTONCHECK or Check);
  end
else
dbgrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);

{ Campo 3. }
 if CompareText(Column.FieldName, 'flag_subcomp') = 0 then
  begin
  Check := 0;
   if IBDataset3['flag_subcomp'] = '1' then
      Check := DFCS_CHECKED;
      dbGrid1.Canvas.FillRect(Rect);
      DrawFrameControl(dbGrid1.Canvas.Handle, Rect,
     DFC_BUTTON, DFCS_BUTTONCHECK or Check);
   end
 else
   dbgrid1.DefaultDrawColumnCell(Rect,DataCol,Column,State);
 end;
end;

procedure TForm1.DBGrid1CellClick(Column: TColumn);
begin
if Column.FieldName = 'FLAG_SUBCOMP' then
   begin
     IBDataset3.Edit;
     if IBDataset3.FindField('FLAG_SUBCOMP').AsInteger = 1 then
       IBDataset3.FindField('FLAG_SUBCOMP').AsInteger := 0
     else
       IBDataset3.FindField('FLAG_SUBCOMP').AsInteger := 1;
       IBDataset3.Post;
       Dbgrid1.Repaint;
     end;
end;