onPush method
Implementation
Future<bool> onPush(Map<String?, String> parameters) async
{
// set variables from return parameters
if ((scope != null)) parameters.forEach((key, value) => scope!.setObservable(key, value));
// fire OnReturn event
if (!S.isNullOrEmpty(onreturn)) EventHandler(this).execute(_onreturn);
return true;
}