I have a problem with resetting the values of a <p: selectOneMenu> component that is housed within a <p: dialog> component, it turns out that I have declared the <p: dialog> on the same page where I show it with a < p: commandButton> and I want that when I finish editing the data and press the button again, the component <p: selectOneMenu> comes out with the initial values, and this is not happening, instead it keeps the selection I made previously. Thank you very much for the help you can give me. this is the code of the page. I don't think it is necessary to put the code for the backing beans but they do need it without problem.
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:ui="http://xmlns.jcp.org/jsf/facelets"
xmlns:p="http://primefaces.org/ui"
xmlns:h="http://xmlns.jcp.org/jsf/html"
xmlns:f="http://xmlns.jcp.org/jsf/core">
<body class="areaContenido">
<ui:composition template="../resources/template/tgeneral.xhtml">
<ui:define name="content" class="areaContenido">
<h:form id="guser">
<p:growl id="msgs" showDetail="true" />
<p:dataTable var="usermio" value="#{userBean.lazyModel}" paginator="true" rows="10" class="FuentTable" rowKey="#{usermio.id}"
paginatorTemplate="{RowsPerPageDropdown} {FirstPageLink} {PreviousPageLink} {CurrentPageReport} {NextPageLink} {LastPageLink}"
rowsPerPageTemplate="5,10,15" id="userTable" lazy="true">
<f:facet name="header">
<p:outputLabel value="Gestión de usuarios del sistema" style="font-weight: bold; text-align: center;"/>
</f:facet>
<p:column headerText="Id" width="5%">
<h:outputText value="#{usermio.id}" />
</p:column>
<p:column headerText="Usuario" width="15%" >
<h:outputText value="#{usermio.usuario}" />
</p:column>
<p:column headerText="Nombre" width="20%">
<h:outputText value="#{usermio.nombre}"/>
</p:column>
<p:column headerText="Apellidos" width="25%">
<h:outputText value="#{usermio.apellidos}" />
</p:column>
<p:column headerText="Rol" width="15%">
<h:outputText value="#{usermio.rol.rol}" />
</p:column>
<p:column headerText="Opt" width="15%">
<p:commandButton value="" update=":guser:userEdit" onclick="PF('userDial').show()" icon="ui-icon-pencil" ajax="true" >
<f:setPropertyActionListener value="#{usermio}" target="#{userBean.selecteduser}" />
</p:commandButton>
<p:commandButton value="" update=":guser:userEdit" onclick="PF('cd').show()" icon="ui-icon-key" ajax="true">
<f:setPropertyActionListener value="#{usermio}" target="#{userBean.selecteduser}" />
</p:commandButton>
<p:commandButton value="" update=":guser:userEdit" onclick="PF('cd').show()" icon="ui-icon-cancel" ajax="true">
<f:setPropertyActionListener value="#{usermio}" target="#{userBean.selecteduser}" />
</p:commandButton>
</p:column>
<f:facet name="footer">
<p:button icon="ui-icon-plus" id="nuevo" value="Nuevo" href="/glitic/adm/register.xhtml" title="Nuevo usuario" />
</f:facet>
</p:dataTable>
<p:dialog header="Edición de datos" widgetVar="userDial" modal="true" showEffect="bounce" hideEffect="fade" resizable="false" class="Fuent" responsive="true" >
<p:outputPanel id="userEdit" style="text-align:center;">
<p:panelGrid columns="2" rendered="#{not empty userBean.selecteduser}" columnClasses="label,value">
<h:outputText value="Id:" />
<h:outputText value="#{userBean.selecteduser.id}" />
<h:outputText value="Usuario" />
<p:inputText value="#{userBean.selecteduser.usuario}" id="username" required="true" requiredMessage="Se necesita el usuario"/>
<h:outputText value="Nombres" />
<p:inputText value="#{userBean.selecteduser.nombre}" id="nombre" required="true" requiredMessage="Se necesita el nombre"/>
<h:outputText value="Apellidos" />
<p:inputText value="#{userBean.selecteduser.apellidos}" id="apellidos" required="true" requiredMessage="Se necesita los apellidos"/>
<h:outputText value="Rol" />
<p:selectOneMenu id="sroles" value="#{userBean.selectedrol}" style="width:160px" effect="fold" >
<f:selectItem itemLabel="Escoja un rol para el usuario" itemValue="" />
<f:selectItems value="#{userBean.roles}" var="xroles" itemLabel="#{xroles.rol}" itemValue="#{xroles.id}" />
</p:selectOneMenu>
<h:outputText value="Guardar cambios:" />
<p:commandButton value="Guardar" action="#{cttobean.NVenta()}" ajax="false"/>
</p:panelGrid>
</p:outputPanel>
</p:dialog>
</h:form>
</ui:define>
</ui:composition>
</body>
</html>
