datascroller's scrollerListener="" method is not invoked whe

[suresh.jvm]

"scrollerListener" in <rich:datascroller> is not invoking the
listener method in the backing bean that should be notified after scrolling. whereas the "actionListener" is working fine.

I am currently using version 3.2.1

code snippet:
<a:richDatascroller for="itemList" rendered="#dispatchItemPageBean.showDataScroller}" maxpages="#{dispatchItemPageBean.maxPagesForDataScroller}" ajaxSingle="false" scrollerListener="#{itemListPageBean.changeIconVariation}" />

public void changeIconVariation(DataScrollerEvent event){
..........
..........
}

Issue : scrollerListener="#{itemListPageBean.changeIconVariation}" is not invoked