Grid Field in Black Berry

GridFieldManager grid = new GridFieldManager(4 ,4 , 0);
Bitmap msg = Bitmap.getBitmapResource("msg.png");
BitmapField message = new BitmapField(msg, Field.FOCUSABLE)
{
    protected boolean navigationClick(int status,int time)
    {
       label.setText("Messages");
       Dialog.alert("Message icon selected");
       return true;
    }
};
message.setBorder(border);
Bitmap logs = Bitmap.getBitmapResource("calllogs.png");
BitmapField call_logs = new BitmapField(logs, Field.FOCUSABLE)
{
    protected boolean navigationClick(int status,int time)
    {
      label.setText("Call logs");
      Dialog.alert("Call Logs icon selected");
      return true;
    }
};
call_logs.setBorder(border);
grid.add(message, 0);
grid.add(call_logs, 1);
grid.add(contacts, 2);
grid.add(internet, 3);
grid.add(calendar, 4);
grid.setColumnPadding(13);
grid.setRowPadding(13);
add(grid);
message.setFocusListener(this);
call_logs.setFocusListener(this);