CheckBox на DbGrid-e

procedure DrawGridCheckBox(Canvas: TCanvas; Rect: TRect; Checked: boolean);
var
  DrawFlags: Integer;
begin
  Canvas.TextRect(Rect, Rect.Left + 1, Rect.Top + 1, ' ');
  DrawFrameControl(Canvas.Handle, Rect, DFC_BUTTON, DFCS_BUTTONPUSH or DFCS_ADJUSTRECT);
  DrawFlags := DFCS_BUTTONCHECK or DFCS_ADJUSTRECT;// DFCS_BUTTONCHECK
  if Checked then
    DrawFlags := DrawFlags or DFCS_CHECKED;
  DrawFrameControl(Canvas.Handle, Rect, DFC_BUTTON, DrawFlags);
end;
 
 
 
 
На событие OnDrawColumnCell повесьте вызов процедуры DrawGridCheckBox(): 
 
 
 
procedure TForm1.DBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
  DataCol: Integer; Column: TColumn; State: TGridDrawState);
begin
  if Column.FieldName = 'WEIGHT' then // Модифицируйте под себя
    if Column.Field.AsInteger > 10 then
      DrawGridCheckBox(DBGrid1.Canvas, Rect, true)
    else
      DrawGridCheckBox(DBGrid1.Canvas, Rect, false)
end;