Changing view Objects & refreshing coresponding controls

FacesContext fctx = FacesContext.getCurrentInstance();
ValueBinding vb1 = fctx.getApplication().createValueBinding("#{bindings.ViewObj1Iterator}");
DCIteratorBinding UserListView = (DCIteratorBinding)vb1.getValue(fctx);
ViewObject vo = UserListView.getViewObject
vo.setNamedWhereClauseParam("PRole_id",1);
vo.executeQuery();