[NAO RESOLVIDO]Combos aninhados

private SelectItem[] deps;

   public SelectItem[] getListPredios() throws ClassNotFoundException, SQLException {
        List<Predio> lp = pDAO.getAllPredios();
        List<SelectItem> itens = new ArrayList<SelectItem>(lp.size());
        for (Predio p : lp) {
            itens.add(new SelectItem(p.getId(), p.getNome()));
        }
        return itens.toArray(new SelectItem[itens.size()]);
    }

    public SelectItem[] getDepByPredios(int ID) throws SQLException {
        List<Setor> deps = sDAO.getSetorDoPredio(ID);
        List<SelectItem> itens = new ArrayList<SelectItem>(deps.size());

        for (Setor s : deps) {
            itens.add(new SelectItem(s.getId(), s.getNome()));
        }// for end
        return itens.toArray(new SelectItem[itens.size()]);
    }

    public void actionCarregarEstados() throws SQLException {
        this.deps = getDepByPredios(getManifest().getSetor().getId());
        System.out.println(deps);
    }

    public SelectItem[] getDeps() {
        return deps;
    }

    public void setDeps(SelectItem[] deps) {
        this.deps = deps;
    }

<h:form>
            <p:panel header="Predio/Setor Combo" style="width:550px;">
                <h:panelGrid columns="2">
                    <h:outputLabel value="Comarca:"/>		
                    <h:selectOneMenu value="#{manifestacaoBean.manifest.predio.id}" required="true" >
                        <f:selectItem itemLabel="Selecione o Comarca" itemValue="Nenhum" />
                        <f:selectItems value="#{manifestacaoBean.listPredios}" />
                        <p:ajax update="depmets" listener="#{manifestacaoBean.actionCarregarEstados}" />
                    </h:selectOneMenu>

                    <h:outputLabel value="Setor:">
                        <h:selectOneMenu id="depmets" value="#{manifestacaoBean.manifest.setor.id}">
                            <f:selectItem itemLabel="Selecione o setor" itemValue="Nenhum" />
                            <f:selectItems value="#{manifestacaoBean.deps}"/>
                        </h:selectOneMenu>
                    </h:outputLabel>
                </h:panelGrid>
            </p:panel>
        </h:form>