public Panel getNextPanelQuestion(){
      if (nextQuestion == QueStatus.Q1_GAS_TYPE) return new QP1_GasType(gasSAXManager);
      else if (nextQuestion == QueStatus.Q2_ASK_BRAND) return new QP2_AskBrand(gasSAXManager);
      else if (nextQuestion == QueStatus.Q3_CHOOSE_BRANDS) return new QP3_ChooseBrands(gasSAXManager);
      else if (nextQuestion == QueStatus.Q4_PRICE_OR_DISTANCE) return new QP4_PriceDistance(gasSAXManager);
      return new QP1_GasType(gasSAXManager);
  }