GUI question

I have just started writing a simple gui application . I add to the
frame and ImageIcon(an image as the background) .then i added a
textArea . the textArea dissapears . Why ?

here is the code ...

import javax.swing.*;
import java.awt.*;

public class chatGUI {

    JFrame frame = new JFrame();
    JLabel contacts = new JLabel();
    JTextArea sendRecieveArea = new JTextArea();
    JTextArea typingArea = new JTextArea();
    JLabel backgroundLabel;

    public chatGUI()
    {

        frame.setLayout(null);
        frame.setTitle("Chat");
        frame.setBounds(300,200,500,500);

        backgroundLabel = new JLabel(new
ImageIcon("graphics/background.gif"));
        backgroundLabel.setBounds(0,0,500,500);
        frame.add(backgroundLabel);

        sendRecieveArea.setBounds(0,0,350,300);
        sendRecieveArea.setLineWrap(true);
        frame.add(sendRecieveArea);

        typingArea.setLineWrap(true);
        typingArea.setBounds(10,330,400,100);
        frame.add(typingArea);

        frame.setVisible(true);
    }

    public static void main(String args[])
    {
        chatGUI gui = new chatGUI();

    }
}

Thanx in advance for your help.
3ashmawy