TextField не доступно

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
 
 
public class DialogPlus extends Dialog implements ActionListener {
    TextField nameField, ageField, illField;
 
    public DialogPlus(Frame parent, String name, boolean mode){
        super(parent, name, mode);
        setSize(500, 400);
 
        Panel namePanel = new Panel(new BorderLayout());
        namePanel.setMaximumSize(new Dimension(300,30));
        namePanel.add(new Label("Name: "), BorderLayout.WEST);
        nameField = new TextField();
        nameField.setMaximumSize(new Dimension(100,10));
        namePanel.add(nameField, BorderLayout.EAST);
 
        Panel agePanel = new Panel(new BorderLayout());
        agePanel.setMaximumSize(new Dimension(300,30));
        agePanel.add(new Label("Age: "), BorderLayout.WEST);
        agePanel.add(ageField = new TextField(100), BorderLayout.EAST);
 
        Panel illPanel = new Panel(new BorderLayout());
        illPanel.setMaximumSize(new Dimension(300,30));
        illPanel.add(new Label("Ill: "), BorderLayout.WEST);
        illPanel.add(illField = new TextField(100), BorderLayout.EAST);
 
        Panel pane = new Panel();
        pane.setLayout(new BoxLayout(pane, BoxLayout.Y_AXIS));
 
        pane.add(namePanel, pane);
        pane.add(Box.createVerticalStrut(20));
        pane.add(agePanel, pane);
        pane.add(Box.createVerticalStrut(20));
        pane.add(illPanel, pane);
        add(pane);
 
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent windowEvent) {
                dispose();
            }
        });
 
        setVisible(true);
    }
 
    @Override
    public void actionPerformed(ActionEvent actionEvent) {
 
    }
 
    public Insets getInsets(){
        return new Insets(10,10,10,10);
    }
}