I have a problem by programming an user interface. I am using Swing.
I begin to create a Tabpane with 5 Tabs.  

Tab 1 contains: Button1 and a textarea  

Tab 2 contains: Button2 and a textarea  

Tab 3 contains: Button3 and a textarea  

Tab 4 contains: Button4 and Panel1  

Tab 5 contains: Button5 and Panel2  

This class MyClass implements the interface ActionListener and the method actionPerformed was overwritten like this (short version):

```
public class MyClass implements ActionListener {

    //  Creating UI ... and so on

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button1) {
            //do something
        }
        // Exactly the same for button2 and button3

        if (e.getSource() == button4) {
            panel1.repaint(); // PANEL 1
        }
        if (e.getSource() == button5) {
            panel2.repaint(); // PANEL 2
        }
    }
}

```

I have two classes Panel1 and Panel2, which extend the class JPanel.

```
public class Panel1 extends JPanel {

    protected Panel1() {
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        //DRAW SOMETHING ON PANEL1
    }
}

```

The class for Panel2 looks exactly like this class, but draws something on panel2.

My problem is now:

In MyClass i have created the UI and all components for it. This includes 5 buttons. On each of these 5 buttons i have called the method:
 buttonX.addActionListener( new MyClass() );

to do exactly what is defined in the actionPerformed() - method.

If i add this ActionListener to button1-3 : Everything works fine.  

If i add this ActionListener to button1-4 (NOT 5) : button1-3 do what they should do and button4 repaints Panel1 correctly.  

If i add this ActionListener to button1-3 and 5 (NOT 4) : button1-3 do what they should do and button5 repaints Panel2 correctly.  

BUT if i add this ActionListener to button1-5 : button1-3 do what they should do and button5 repaints Panel2 correctly. BUT button4 does nothing!. So Panel1 was not repainted!  

Can somebody explain me, why button1-3 always work; button4 and button5 work, if i add the ActionListener to just ONE of theses two buttons; BUT button4 does NOT work, if i add the ActionListener to all 5 buttons?!  

Thanks guys for your help  

Best regards  

Alex