Problems: button with image

Question

hallo,
i have the following problem:
I've written this class:
import java.awt.*;
public class ImageButton
extends Button
     private Image img;
     public ImageButton(String fname)
     img = getToolkit().getImage(getClass().getResource(fname));
          MediaTracker mt = new MediaTracker(this);
          mt.addImage(img, 0);
     try {
          //Warten, bis das Image vollst�ndig geladen ist,
          //damit getWidth() und getHeight() funktionieren
          mt.waitForAll();
          } catch (InterruptedException e) {
          //nothing
     public void paint(Graphics g)
          int a=(this.getWidth()-getPreferredSize().width)/2;
          int b=(this.getHeight()-getPreferredSize().height)/2;
          g.drawImage(img,a,b,this);
          super.paint(g);
     public void update(Graphics g)
          paint(g);
     public Dimension getPreferredSize()
          return new Dimension(
          img.getWidth(this),
          img.getHeight(this)
     public Dimension getMinimumSize()
          return new Dimension(
          img.getWidth(this),
          img.getHeight(this)
when the frame appears, where the button is shown, the icon is shown. But when I click on the button, the icon is away and i don't know, where is the problem.
I don't use swing because i don't like the perfomance.
why is the image away, when i'm clicking on the button or another frame is over the button and disappears.

Answer 1

just do not call super.paint(g) in paint() implementation