how to understand which item was clicked in p:selectCheckboxMenu

[Rmin_37]

is there any way to understand which item was clicked in p:selectCheckboxMenu with ajax?
something like :

Code: Select all

<f:selectItems value="#{courseListMg.categoryList}" var="cats"
                                   itemLabel="{cats.title}" itemValue="#{cats.categoryId}">
            <p:ajax event="change" listener="#{courseListMg.categorySelect(cats)}"/>
 </f:selectItems>

i searched a lot but couldn't find a way