JSF/Primefaces issue when form field rendering depends on selectOneMenu - jsf

Question

Form field rendering is depending on selected item in selectOneMenu.
Page:
<h:body>
<f:view>
<h:form>
<h:panelGrid>
<p:inputText value="#{user.username}"/>
<p:selectOneMenu value="#{user.moreInputs}"
required="true">
<p:ajax event="change"
update="moreInputGrid"/>
<f:selectItem itemLabel="" itemValue=""/>
<f:selectItems value="#{user.selectItems}"/>
</p:selectOneMenu>
</h:panelGrid>
<h:panelGrid id="moreInputGrid">
<p:inputText rendered="#{user.renderMoreInputs}"
value="#{user.name}"/>
</h:panelGrid>
<p:commandButton action="#{user.register}"
value="Register user"/>
</h:form>
</f:view>
</h:body>
Backing bean:
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.model.SelectItem;
#ManagedBean
#ViewScoped
public class User {
private String username;
private MoreInputs moreInputs;
private String name;
public enum MoreInputs {
YES,
NO
}
public boolean isRenderMoreInputs() {
return (moreInputs == MoreInputs.YES);
}
public SelectItem[] getSelectItems() {
SelectItem[] items = new SelectItem[2];
items[0] = new SelectItem(
MoreInputs.YES,
"yes");
items[1] = new SelectItem(
MoreInputs.NO,
"no");
return items;
}
public String register() {
return null;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public MoreInputs getMoreInputs() {
return moreInputs;
}
public void setMoreInputs(MoreInputs moreInputs) {
this.moreInputs = moreInputs;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Issue arrises if the client does page refresh after choosing an item causing form fields to render. Such form fields will not be rendered on page refresh, although they should. Plus, if client then tries to submit form, validation is skipped for those hidden fields and form is successfully processed.
Am I doing something wrong? Is there an elegant solution?