function Button1Click($sender, $params)
    {

        $preenchidos = array();
        $duplicata = array();

        for($i = 1; $i <= 3; $i++){
          $this->debug_to_console($i);

          $comboAtual = "ComboBox" . $i;

          $comboAtualValor = $this->$comboAtual->ItemIndex;

          $this->debug_to_console("valor " . $comboAtualValor);

          if(!in_array($comboAtualValor, $preenchidos)){
            array_push($preenchidos, $comboAtualValor);
            $this->$comboAtual->Color = "";
          } else {
            $this->$comboAtual->Color = "red";
            $this->Label1->Caption = "Duplicata";
          }
        }
    }