Add component to existing GUI

Question

hi,
I have created simple GUI with one panel containing button and textfield:
public class GUIClass{
private JTextField textField1;
private JButton button1;
private JPanel mainPanel;
private final JFrame frame;
public GUIClass() {
frame = new JFrame("hello");
button1.addActionListener(new pushbutton());
public static void main(String[] args){
GUIClass GU = new GUIClass();
GU.frame.setContentPane(GU.mainPanel);
GU.frame.pack();
GU.frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
GU.frame.setSize(400,400);
GU.frame.setVisible(true);
class pushbutton implements ActionListener {
public void actionPerformed(ActionEvent ae){      
textField1.setText(textField1.getText()+"hello");
my question is, if I want to add a new button (or any other simple component) after pressing button1, what should I do?
thanks
Koby

Answer 1

hi,
The two operations ( YourPanel.add(newComponent); YourPanel.validate();) are working, but I can see the changes only after I change the window size or minimize and restore it(wired).
In addition I recive a list of errors from the-> YourPanel.add(newComponent);
note: I created the GUI with GUI designer and probably I should do something more in order to insert new component to the panel ?!
Do you have any idea?
thanks
Koby