AjaxUpdate component not found for id: :fForm:null

[Rocksss]

Hi,

In my appication, I am using Ajax with Myfaces (JSF 1.2) & Jboss 4.2.1.

I m generating a table having (couple of selectmenu) dynamically by using the binding attribute of <h:panelGrid> and made that table Ajaxed. When i select some item form the select menu its works fine with Myfaces (JSF 1.2) but when I switched to Sun RI implementaion I got "AjaxUpdate component not found for id: :fForm:null" as exception in the console.

Could anyone help me out?