private void selectDataSource()
    {
        switch (dataSourceCombo.getSelectedIndex())
        {
            case 0:
                DatabaseManager.setGetQuestionsFromDatabaseStrategy(new GetQuestionsFromSqliteDatabase());
                break;
            case 1:
                DatabaseManager.setGetQuestionsFromDatabaseStrategy(getMySQLQuestionsStrategy());
                break;
            default:
                throw new NotImplementedException();
        }

    }