Combo value set to null when made visible

[basis.cedric]

Hi,
I've got a problem with comboboxes which values are reset when combo is hidden and shown again. These combos are inside SectionItem and I close and open the SectionItem the values are lost. I've put a changehandler on a combo to make a test and saw that oldValue is OK, and that the new value set is null.

The combo is created this way:

ComboBoxItem itemPartido = new ComboBoxItem();
		itemPartido.setName("partido");
		itemPartido.setTitle("Partido");
		itemPartido.setDisplayField("sigla");
		itemPartido.setValueField("id");
		itemPartido.setWidth(ConstantesConfigCampo.LARGURA_CAMPO_DATA_MEDIO);
		itemPartido.setOptionDataSource(DataSource.get(Constantes.DS_PARTIDO));
	itemPartido.setPrompt(SinoMensagensHolder.mensagens.dt04());
	itemPartido.setSortField("sigla");

I'm including the main ds (vinculoParlamentar) and the option ds (partido).
I've tested this in FF 21 with 3.0p-2012-08-22 and 3.0p-2013-05-06. GWT version is 2.4.0.

[Isomorphic]

We're not reproducing this effect. We'd recommend just moving to 3.1 now, there's no reason to continue with 3.0.