Try to wrap all the regions to h:panelGroup and reRender it. I think that a4j:region can't be a reRender-able wrapper.
I have wrapped all the region to <h:panelGroup> but the problem still remains same. I am not able to reRender the region once click on the <a4j:commandButton />
Kindly help me..
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1) Could you post the whole page, please?
2) I guess you problem can be in forms. Do you have only one form or a few forms on the page? Because if a4j:commadButton in a different form you should use "formID:panelGroupId" instead of "panelGroupId" in reRender attribute.
I have resolve the problem by using following attributes in <a4j:region>
<a4j:region renderRegionOnly="false" immediate="true">
Thanks once again for you help.