procedure TFormPrincipal.Selecionar1Click(Sender: TObject);
var
Rect: TRect;
Field: TField;
State: TGridDrawState;
begin
if gdFocused in State then
with (Sender as TDBGrid).Canvas do
begin
Brush.Color:=clRed;
FillRect(Rect);
TextOut(Rect.Left, Rect.Top, Field.AsString);
end;
end;