Untitled

<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:f="http://java.sun.com/jsf/core"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:a4j="http://richfaces.org/a4j"
    xmlns:rich="http://richfaces.org/rich">

<h:head>
</h:head>
<h:body>
    <h:form >
   <a4j:queue name="someQueue"/>
       <h:panelGrid columns="2">
      <h:selectOneListbox value="#{colorsBean.color}">
         <f:selectItem itemValue="green" itemLabel="Green" />
         <f:selectItem itemValue="blue" itemLabel="Blue" />
         <f:selectItem itemValue="red" itemLabel="Red" />
         <f:selectItem itemValue="yellow" itemLabel="Yellow" />
         <f:selectItem itemValue="orange" itemLabel="Orange" />
         <f:selectItem itemValue="grey" itemLabel="Grey" />
         <f:selectItem itemValue="pink" itemLabel="Pink" />
      </h:selectOneListbox>

        <a4j:commandButton id="btn1" value="select"
                    action="#{colorsBean.select}"  render="colorPanel"/>
        <a4j:commandButton id="btn2" value="tryanother"
                    action="#{colorsBean.tryanother}"  >
                    <a4j:attachQueue name="dddd" requestDelay="0"></a4j:attachQueue>
                    </a4j:commandButton>
      <h:panelGrid id="colorPanel" bgcolor="#{colorsBean.color}">
         <h:outputText value="RichFaces" style="FONT-WEIGHT: bold; FONT-SIZE: xx-large;" />
      </h:panelGrid>
   </h:panelGrid>
    </h:form>
 <a4j:status id="stateStatus" startText="Working..."
   startStyle="background-color: #ffA500;
   font-weight:bold;
   position:absolute;
   right: 50%;
   top: 1px;
   width: 100px;" />
</h:body>
</html>

public class ColorsBean {

    private String color;
    // getter and setter

    public void select() {

         try {
             Thread.sleep (5000);
          } catch (InterruptedException e) {
             e.printStackTrace();
          }
         System.out.println("color is:"+color+"  "+ new Date());
    }

    public void tryanother() {
        System.out.println("********tryanother********" + new Date());

    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

}