Can't change page p:dataTable - jsf

Question

I have implemented code to do a table lazy in primefaces so I have method paginated which ones retrieves info. The problem the number of each page it is not showed. So if I have 100 I only see 15 elements anymore. The page button is not showed.
Like in this screenshot:
In the bean:
#PostConstruct
public void init() {
listadoPedidos = new LazyDataModel<Pedido>() {
private static final long serialVersionUID = 1L;
#SuppressWarnings("unchecked")
#Override
public List<Pedido> load(int first, int pageSize, String sortField, sortOrder sortOrder,
Map<String, Object> filters) {
List<Pedido> lista = new ArrayList<Pedido>();
boolean ordenar = sortOrder == SortOrder.ASCENDING ? true : false;
try {
lista = commonService.obtenerListaPaginada(Pedido.class, first, pageSize, "", "", "", "", campos);
listadoPedidos.setRowCount(lista.size());
} catch (Exception e) {
e.printStackTrace();
MensajesErrores.error(e.getMessage());
}
return lista;
}
};
}
And the JSF is:
<p:dataTable
id="tablaUsuario"
rowIndexVar="secuencial"
emptyMessage="#{msgs.lbl_no_hay_datos}"
value="#{pedidoBean.listadoPedidos}"
var="_pedido"
paginator="true"
paginatorPosition="top"
style="width:100%"
selection="#{pedidoBean.pedido}"
selectionMode="single"
rowKey="#{_pedido.rowKey}"
sortBy="#{_pedido.id}"
sortOrder="DESCENDING"
lazy="true"
rows="15"
paginatorTemplate="
{CurrentPageReport}
{FirstPageLink}
{PreviousPageLink}
{PageLinks}
{NextPageLink}
{LastPageLink}
{RowsPerPageDropdown}"
rowsPerPageTemplate="15,25,50,100"
>
<p:column filterStyleClass="input-text"
styleClass="columnaDTCodigo tableCell"
headerText="#{msgs.lbl_numero}">
<h:outputText value="#{_pedido.id}" />
</p:column>
</p:dataTable>
I really don´t see the error, the dropdown With number of register works well.

Answer 1

My mistake was in this line:
listadoPedidos.setRowCount(lista.size());
replace with
listadoPedidos.setRowCount(TOTAL_ROWS_IN_DATABASE);