title: How to override downloaded image with default image to black berry list field
body: <p>From the past two days i am doing list field with web image in black berry,because i am new.
  I am displaying list field with some default image.when i dowloaded the actual image from web it can't replacing on default image.I used one thread to load images one by one.But images are not overriding with default image properly.Please help me.Here is my code
  of list field.</p>
  
  <pre><code>public void drawListRow(ListField listField,final Graphics graphics,int index,
          final int y, int width)
  {
      this.graphics=graphics;
      this.inde=index;
      class ImageDowload extends Task
      {
  
          void doTask()
          {
  
              load=new  DowloadImage(picture[inde]);
              if(load.getData()!=null)
              {
                  _bmap=load.getBitmap();
  
                  graphics.drawBitmap(3,y+7,placeholder.getWidth(), placeholder.getHeight(),_bmap, 0, 0);
              }
  
  
          }
  
  
  
      }
  
      taskWorker.addTask(new ImageDowload());  
  
      String text=(String) get(listField, index);
  String pricedetails=price[index];
      graphics.setColor(rgb);
      graphics.setFont(Utility.getBigFont(DConfig.getFSize()+4));
      graphics.drawBitmap(3,y+7,placeholder.getWidth(), placeholder.getHeight(),placeholder, 0, 0);
  graphics.drawText(text,100,y+25);  
  graphics.drawText(pricedetails+" $",420,y+25); 
  graphics.drawLine(0, y+74, DConfig.disWidth, y+74);
  
  }
  </code></pre>