Not able to capture button event in extended controller

Hi Gurus,
I am not able to capture the button event (of seeded controller) in extended controller.
I have written code in extended controller like below:
public void processFormRequest(OAPageContext pageContext, OAWebBean webBean){
    String str = pageContext.getParameter("event"); // copied from seeded controller for the button event //
      if ("editLines".equals(str)) {
        //cutom validation
  super.processFormRequest(pageContext, webBean);
Please help me in resolving the issue.
Thanks,
Srinivas
    ///my cutom validateion

Hi Bm,
Thanks for your response.
I have tried the same but no luck.
Please help in getting this resolved.
Thanks,
Srinivas

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