How to execute navigation in RegionNavigationEvent of af:region



    public void onDynamicReqionnavigation(RegionNavigationEvent regionNavigationEvent) {
        System.out.println("*******onDynamicReqionnavigation**********");
        try{
        if (regionNavigationEvent.getNewViewId() == null) {
                navigate("back");
        }
        }catch(Exception ex){
            ex.printStackTrace();
            JSFUtils.reportException(ex);
        }
    }

    public void navigate(String controlFlowCase){
           NavigationHandler nvHndlr  =
           FacesContext.getCurrentInstance().getApplication().getNavigationHandler();
           nvHndlr .handleNavigation(FacesContext.getCurrentInstance(), null,
           controlFlowCase);
       }

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