Problem med JPanel (igen)

Hej

Ja, så er den gal igen.
Jeg kan altså ikke få det JPanel til at sidde ordenligt :(

Det bliver ved at at forsvinde, selvom der har fået sat en fin størrelse. Hvis jeg begynder at flytte bare lidt med det så overskriver det lige pludselig mine knapper, og jeg er ved at være total blank på hvad jeg kan gøre.

Her er koden:

/**
* @Author Claus Jørgensen
* @Date 14.02.05
* @Version 1.0.0
* @JavaVersion 1.4.3
*
* Required Files:
*
* - PaintMetoder.java
* - JavaPaint_AboutBoxPanel1.java
*
*/
package paintpack;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.awt.Dimension;
import javax.swing.JLabel;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.ScrollPane;
import java.awt.Label;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Panel;
import java.util.*;
import javax.swing.JComboBox;
import javax.swing.BorderFactory;

public class JavaPaint extends JFrame
{

  int xPos;
  int yPos;
  int x;
  int y;
  boolean clicked = false;
  String figur = "cirkel";
  private JMenuItem menuHelpAbout = new JMenuItem();
  private JMenu menuHelp = new JMenu();
  private JMenuItem menuFileExit = new JMenuItem();
  private JMenu menuFile = new JMenu();
  private JMenuBar menuBar = new JMenuBar();
  private JButton ValgFirkant = new JButton();
  private GridLayout gridLayout1 = new GridLayout();
  private PaintMetoder metoder;
  private JButton ValgCirkel = new JButton();
  String[] colors = { "blue", "red" , "yellow", "green" };
  private JComboBox ColorChooser = new JComboBox(colors);
 

  public JavaPaint()
  {
    try
    {
      jbInit();
    }
    catch(Exception e)
    {
      e.printStackTrace();
    }
  }
 
  public static void createAndShowGUI()
  {
    JFrame JavaPaint = new JavaPaint();
    JavaPaint.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JavaPaint.setDefaultLookAndFeelDecorated(true);
    JavaPaint.setVisible(true);
  }
 
  public static void main(String[] args)
  {
    javax.swing.SwingUtilities.invokeLater(new Runnable()
    {
      public void run()
      {
        createAndShowGUI();
      }
    });
  } 

  private void jbInit() throws Exception
  {
    this.getContentPane().setLayout(null);
    this.setSize(new Dimension(593, 435));
    this.setTitle("JavaPaint");
    this.setBackground(new Color(219, 218, 221));
    this.getContentPane().setLayout(null);

    // Knapper
    ValgFirkant.setText("Firkant");
    ValgFirkant.setBounds(new Rectangle(10, 345, 75, 25));
    ValgFirkant.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          ValgFirkant_actionPerformed(e);
        }
      });
    this.getContentPane().add(ColorChooser, null);
    this.getContentPane().add(ValgCirkel, null);
    this.getContentPane().add(ValgFirkant, null);

    // Menubar
    this.setJMenuBar(menuBar);
    menuFile.setText("Fil");
    menuFileExit.setText("Luk");
    menuFileExit.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent ae)
        {
          fileExit_ActionPerformed(ae);
        }
      });
    menuHelp.setText("Hjælp");
    menuHelpAbout.setText("Omkring JavaPaint");
    menuHelpAbout.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent ae)
        {
          helpAbout_ActionPerformed(ae);
        }
      });
    menuFile.add(menuFileExit);
    menuBar.add(menuFile);
    menuHelp.add(menuHelpAbout);
    menuBar.add(menuHelp);
   
    // Centrerer programmet på skærmen
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    Dimension frameSize = this.getSize();
    this.setResizable(false);
    this.addMouseListener(new MouseAdapter()
      {
        public void mouseClicked(MouseEvent e)
        {
          this_mouseClicked(e);
        }
      });
    if (frameSize.height > screenSize.height)
    {
      frameSize.height = screenSize.height;
    }
    if (frameSize.width > screenSize.width)
    {
      frameSize.width = screenSize.width;
    }
    this.setLocation((screenSize.width - frameSize.width) / 2, (screenSize.height - frameSize.height) / 2);
    ColorChooser.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          ColorChooser_actionPerformed(e);
        }
      });
    ColorChooser.setBounds(new Rectangle(170, 345, 105, 25));
    this.setResizable(false);
    ValgCirkel.addActionListener(new ActionListener()
      {
        public void actionPerformed(ActionEvent e)
        {
          ValgCirkel_actionPerformed(e);
        }
      });
    ValgCirkel.setBounds(new Rectangle(90, 345, 75, 25));
    ValgCirkel.setText("Cirkel");
    metoder.setBounds(new Rectangle(0, 0, frameSize.width, 250));
    metoder.setBackground(Color.white);
    this.getContentPane().add(metoder);
  }

  void fileExit_ActionPerformed(ActionEvent e)
  {
    System.exit(0); // "Luk" menuen
  }

  void helpAbout_ActionPerformed(ActionEvent e)
  {
    // "Hjælp" menuen
    JOptionPane.showMessageDialog(this, new JavaPaint_AboutBoxPanel1(), "Omkring JavaPaint", JOptionPane.PLAIN_MESSAGE);
  }
 
  private void ValgCirkel_actionPerformed(ActionEvent e)
  {
    metoder.setFigur("CIRKEL");
  }

  private void ValgFirkant_actionPerformed(ActionEvent e)
  {
    metoder.setFigur("FIRKANT");
  }

  private void this_mouseClicked(MouseEvent e)
  {
    metoder.updateTegneArea(e.getX(),e.getY());
  }

  private void ColorChooser_actionPerformed(ActionEvent e)
  {
    JComboBox cb = (JComboBox)e.getSource();
    String ValgtFarve = (String)cb.getSelectedItem();
    if(ValgtFarve != null)
    {
      metoder.setFarve(ValgtFarve);
    }
  }

}


-------------------------------------------------------------------------------------------------------------------

/**
* PaintMetoder
* Metoder som bruges til at tegne i JavaPaint
*/
package paintpack;
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
import java.awt.Dimension;
import javax.swing.JLabel;
import java.awt.BorderLayout;
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.ScrollPane;
import java.awt.Label;
import java.awt.event.MouseListener;
import java.awt.event.MouseEvent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Panel;
import java.util.*;

public class PaintMetoder extends JPanel
{
  int xPos;
  int yPos;
  String ValgtFigur = "CIRKEL";
  String ValgtFarve = "blue";
 
  public void setFigur(String figur)
  {
    ValgtFigur = figur;
  }
 
  public void setFarve(String farve)
  {
    ValgtFarve = farve;
  }
 
  public void updateTegneArea(int getX,int getY)
  {
    xPos = getX;
    yPos = getY;
    repaint();   
  }

  public void paint(Graphics g)
  {
    super.paint(g);
    tegnFigur(ValgtFigur,ValgtFarve,g);
  }
 
  public void tegnFigur(String figur,String farve, Graphics g)
  {
    int width = 100;
    int height = 100;
    int x = xPos - width/2 + 5;
    int y = yPos - height/2 - 45;
    g.setColor(Color.decode(farve));
    g.fillRect(20,20,80,80);

    if(figur == "FIRKANT")
    {
      g.setColor(Color.decode(farve));
      g.fillRect(x,y,80,80);
    }     
    if(figur == "CIRKEL")
    {
      g.setColor(Color.decode(farve));
      g.fillOval(x,y,80,80);
    }
  }
}