Java app application

Question

This code when pressed on button definicoes, opens a new window with an image, a line with text and also generates radio Buttons, but the problem is that it creates another new window with radio Buttons and also doubles the JFrame that contains all the buttons, and I don’t want to duplicate the JFrame. What I wanted was to show the image, the text and the radio Buttons all in the same new window. Is there any way to do that? Keeping the JFrame initial that has this button definicoes and also has other buttons, etc.

 if (definicoesBtn == e.getSource()) // botao definicoes premido
 {
     window = new JFrame(" Jogo da Memoria - Definicoes:");
     window.setLayout(new BorderLayout());  

     JLabel label3 = new JLabel(" Definicoes: ");           
     window.add("Center", label3);
     window.resize(300,300);
     window.show();                         
     ImageIcon img = new ImageIcon("definicoes.jpg");
     int altura = img.getIconHeight();  
     int largura = img.getIconWidth(); 
     JLabel label = new JLabel(img);    
     window.add(label, BorderLayout.NORTH);

     MemoryGame formulario1=new MemoryGame(); // cria os radiobutton
     formulario1.setBounds(0,0,300,200);
     formulario1.setVisible(true);

     window.pack();  
     window.setVisible(true); 
 }

My main class is this one on the first lines of code:

public class MemoryGame extends JFrame implements ActionListener, ChangeListener
{
    private JCheckBox check1,check2,check3; // declaracao dos checkbutoes
    //...  
    private JFrame window = new JFrame("Jogo da Memoria");
    // Jframe com todos os botoes janela inicial declarei em MemoryGame()

    public MemoryGame() {  
        setLayout(null);
        check1=new JCheckBox("Inglés");
        check1.setBounds(10,10,150,30);
        check1.addChangeListener(this);
        add(check1);
        check2=new JCheckBox("Francés");
        check2.setBounds(10,50,150,30);
        check2.addChangeListener(this);        
        add(check2);
        check3=new JCheckBox("Alemán");
        check3.setBounds(10,90,150,30);
        check3.addChangeListener(this);        
        add(check3);

And also the function:

 public void stateChanged(ChangeEvent e){
    String cad="";
    if (check1.isSelected()==true) {
        cad=cad+"Inglés-";
    }
    if (check2.isSelected()==true) {
        cad=cad+"Francés-";
    }
    if (check3.isSelected()==true) {
        cad=cad+"Alemán-";
    }
    setTitle(cad);
}

Something must be wrong or incomplete, so I need help to solve or fix the code.