buttonField clicking problem in blackberry

Question

hi

when i am setting the BackGround image through VerticalField Manager. only one buttonField is gettin clicked ,other button field is not working. can i have the solution for it. please if not i want alternative which will position the buttonfield ,set by user. and i want a image as a background

help me out. its urgent..

public GreetingsMainScreen()
{
    homeBackgroundImage=Bitmap.getBitmapResource("com/greetings/Images/HomeBackgroundImage.jpg");

    exitField=new ButtonField("Exit",ButtonField.CONSUME_CLICK);
    exitField.setChangeListener(this);

    greetField=new ButtonField("GREET",ButtonField.CONSUME_CLICK);
    greetField.setChangeListener(this);



    VerticalFieldManager manager = new VerticalFieldManager()
    {
          protected void sublayout(int width, int height)
      {
              width=fwidth;
              height=fHeight;
              super.sublayout(width,height);
              setPositionChild(greetField, width-232, height-150);
              setPositionChild(exitField, width-205, height-110);
             setExtent(width, height);
      }
    };
    manager.setBackground(BackgroundFactory.createBitmapBackground(homeBackgroundImage));
    manager.add(exitField);
    manager.add(greetField);


    add(manager);

}


public void fieldChanged(Field field, int context) {
    if(field == exitField)
    {
        Dialog.alert("Hi");
        System.exit(0);
    }


    if(field == greetField)
    {
        System.exit(0);
    }


}

}

Thanks alot