PrimeFaces p:idleMonitor rendered="false" not working - jsf

Question

I am developing a project with Primefaces 5.1.
In my project, I used p:idleMonitor, on my Start button click the p:idleMonitor rendered="true" is working .
On my Stop button click the p:idleMonitor rendered="false" not working and the p:idleMonitor is still processing.
Sample Code:
index.xhtml
<p:panel id="mainPanelId">
<p:commandButton value="Start" update="mainPanelId" action="{Sample.start}"/>
<p:commandButton value="Stop" update="mainPanelId" action="#{Sample.stop}"/>
<p:idleMonitor timeout="5000" rendered="#{Sample.idleRendered}">
<p:ajax event="idle" oncomplete="PF('dialogId').show();"/>
<p:ajax event="active" oncomplete="PF('dialogId').hide();"/>
</p:idleMonitor>
<p:dialog id="dialogId" widgetVar="dialogId" header="Idle">
<p:outputLabel value="Idle Mode Actived!"/>
</p:dialog>
</p:panel>
Sample.java
class Sample
{
private boolean idleRendered;
public String start()
{
idleRendered = true;
return null;
}
public String stop()
{
idleRendered = false;
return null;
}
}

Answer 1

A few things you should do differently.
Use <h:form>
Use actionListener by p:commandButton and void methods of your bean
XHTML
<h:form>
<p:panel id="mainPanelId">
<p:commandButton value="Start" update="mainPanelId"
actionListener="#{Sample.start}" />
<p:commandButton value="Stop" update="mainPanelId"
actionListener="#{Sample.stop}" />
<h:outputText value="#{Sample.idleRendered}" />
<p:idleMonitor timeout="5000" rendered="#{Sample.idleRendered}">
<p:ajax event="idle" oncomplete="PF('dialogId').show();" />
<p:ajax event="active" oncomplete="PF('dialogId').hide();" />
</p:idleMonitor>
<p:dialog id="dialogId" widgetVar="dialogId" header="Idle">
<p:outputLabel value="Idle Mode Actived!" />
</p:dialog>
</p:panel>
</h:form>
Bean
#Named("Sample")
#SessionScoped
public class Sample implements Serializable {
private boolean idleRendered = true;
public void start() {
idleRendered = true;
}
public void stop() {
idleRendered = false;
}
public boolean isIdleRendered() {
return idleRendered;
}
public void setIdleRendered(boolean idleRendered) {
this.idleRendered = idleRendered;
}
}
Update:
Looks like a bug, here is a workaround:
<p:outputPanel rendered="#{Sample.idleRendered}">
<p:idleMonitor timeout="5000">
<p:ajax event="idle" oncomplete="PF('dialogId').show();" />
<p:ajax event="active" oncomplete="PF('dialogId').hide();" />
</p:idleMonitor>
</p:outputPanel>