JRadioButton isn't visible

if(((iQuestion)(questions.get(Index))).GetPreferredQuestionHandlingType().equals("RadioButton")){
             ArrayList choices = ((iQuestion)(questions.get(Index))).GetChoices();

             jRadioButton_Answer.setText(choices.get(0).toString());
             jRadioButton_Answer.setVisible(true);
             answersgroup.add(jRadioButton_Answer);

             for(int i = 1; i < choices.size(); i++)
             {
                JRadioButton newButton = new JRadioButton();
                this.add(newButton);
                newButton.setText(choices.get(i).toString());
                newButton.setVisible(true);
                newButton.setLocation(jRadioButton_Answer.getLocation().x, jRadioButton_Answer.getLocation().y - 10);
                
                answersgroup.add(newButton);            
             }
        }




public class TrueFalseQuestion implements iQuestion {
    public TrueFalseQuestion() {

    }

    private String questionText = "";
    private boolean correctAnswer = false;
    private String questionType = "True or False Question";
    private boolean studentsAnswer = false;
    private boolean haschoices = true;
    private boolean hassecondarychoices = false;
    private String preferredquestionhandlingtype = "RadioButton";
    private DefaultTableModel receivedanswers = new DefaultTableModel();

    public boolean GetCorrectAnswer(){
        return correctAnswer;
    }

    public void SetCorrectAnswer(boolean Answer){

        correctAnswer = Answer;
    }

    public String GetQuestionType()
    {
        return questionType;
    }

    public String GetQuestionText()
    {
        return questionText;
    }

    public void SetQuestionText(String text)
    {
        questionText = text;
    }

     public boolean HasChoices(){
        return haschoices;
    }

      public boolean HasSecondaryChoices(){
        return hassecondarychoices;
    }

     public ArrayList GetSecondaryChoices() {
        return new ArrayList();

    }
    public String GetPreferredQuestionHandlingType() {
        return preferredquestionhandlingtype;
    }
    public ArrayList GetChoices() {
        ArrayList choices = new ArrayList();
        choices.add("True");
        choices.add("False");


        return choices;

    }
    public void SetReceivedAnswers(DefaultTableModel Answers)
    {
        receivedanswers = Answers;
    }
    public DefaultTableModel GetReceivedAnswers() {
        return receivedanswers;
    }



}

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