How can I create the <a4j:ajax event="change" /> in the bean?

[warleymendes]

Hi, I need to create this code in my bean:

<rich:calendar value="#{toolbarBean.data}" datePattern="dd/MM/yyyy" valueChangeListener="#{toolbarBean.selecionarData}">

     <a4j:ajax event="change" />

</rich:calendar>

But I don't know how can I create the <a4j:ajax event="change" /> and put it inside de component calendar:

That is my code:

UICalendar calendar = (UICalendar)ctx.getApplication()

    .createComponent(ctx, UICalendar.COMPONENT_TYPE,

    "org.richfaces.CalendarRenderer");

calendar.setId("c");       

calendar.setDatePattern("dd/MM/yyyy");

calendar.setValueExpression("value",  newValueExpression(ctx, "#{toolbarBean.data}", Date.class));       

calendar.setValueExpression("valueChangeListener", newValueExpression(ctx, "#{toolbarBean.selecionarData}", String.class));

//HERE I NEED TO CREATE THE A4J:AJAX EVENT

Anyone can help me?

Thanks