procedure TForm1.Button1Click(Sender: TObject);
begin
case ComboBox1.ItemIndex of
3,4: Shape1.Brush.Color := clRed;
5,6: Shape1.Brush.Color := clYellow;
7,8,9,10,11,12: Shape1.Brush.Color :=clGreen;
else Showmessage('Este programa no soporta ese valor');
end;
end;