Customize attribute of one panel id of Composite component .in JSF2,2

Question

Test1.xhtml..

I want to use one panel id=d from the composite component on selecting a dropdown value in another (test2.xhtml).I am new to jsf2.2 and struggling to implement my logic with custom components.Thanks in advance.

<composite:interface>
    <composite:attribute name="AA" required="true" type="java.util.ArrayList" />
    <composite:attribute name="BB" required="true" type="java.lang.Object" />
    <composite:attribute name="CC" required="false" type="java.lang.String" />
    </composite:interface>

    <p:selectOneMenu id="a" value="#{}" >
    </p:selectOneMenu>

    <p:selectOneRadio id="b" plain="true" layout="custom" value="#{cc.attrs.bean.hhhh}">  
    </p:selectOneRadio>


    <p:accordionPanel  id="c">
    <p:outputPanel  id="d > 
    <ui:repeat id="post" value="#{cc.attrs.foo}" var="pooo">
    ---------code---------------------------------
    </p:outputPane>
    </ui:repeat>

    </composite:implementation>

Test2.xhtml

How can i use only id=abc from test1.xhtml on the update of selected dropdown

//With these i can acces all the attributes.It is working fine
    <p:outputPanel id="ZZZZ" >
                <deal:Test1 AA="#{someCode}" BB="someCode" CC="#{}" />
            </p:outputPanel>

// But I want to update only one panel id from test1.xhtml.How to achieve that on selecting a drop down value.

    <p:selectOneMenu id="a" value="#{}">
    <p:ajax listener="#{someMethod}" update="d"/>
    </p:selectOneMenu>