renderiza telas xhtml primefaces

Bean.java

@ManagedBean(name="redBean")
@SessionScoped
public class Bean {
	private Integer opcao;
	private Boolean isRederiza = false;
	public Boolean getIsRederiza() {
		return isRederiza;
	}
	public Integer getOpcao() {
		return opcao;
	}
	public void setOpcao(Integer opcao) {
		this.opcao = opcao;
	}
	public void renderizar() {
		if(getOpcao().equals(1)){
			isRederiza = true;
		} else {
			isRederiza = false;
		}
	}
}

jsf.xhtml

<h:form id="form1">
		<p:panel style="width:700px;">
			<p:panelGrid id="grade" columns="1">
				<h:selectOneRadio id="radio" value="#{redBean.opcao}" >    
					<f:selectItem itemValue="1" itemLabel="Paciente" />    
					<f:selectItem itemValue="2" itemLabel="Secreária(o)" />    
					<f:selectItem itemValue="3" itemLabel="Nutricionista" />    
					<f:selectItem itemValue="4" itemLabel="Laboratório de Exames" />    
					<p:ajax listener="#{redBean.renderizar}" update=":form1:grade" /> 
				</h:selectOneRadio>
				<p:fieldset id="pac" legend="Paciente Selecionado" rendered="#{redBean.isRederiza}">
					<h:outputLabel value="Paciente"/>
				</p:fieldset>
			</p:panelGrid>
		</p:panel>
	</h:form>