BlackBerry Create the Custom Button

private class MyCustomButton extends Field implements DrawStyle{
   
  private Bitmap _currentPicture;
     private Bitmap _onPicture; //image for "in focus"
     private Bitmap _offPicture; //image for "not in focus"
     private int width;
     private int height;
     
     //Ctor: pass path to on/off images you're using.
     MyCustomButton (String onImage, String offImage){
      super();
      _offPicture = Bitmap.getBitmapResource(offImage);
      _onPicture = Bitmap.getBitmapResource(onImage);
      _currentPicture = _offPicture;
           
     }
     
     public int getPreferredHeight(){      
      return 80;
     }
     
     public int getPreferredWidth(){
      return 80;
     }
     
 
     public boolean isFocusable(){
      return true;
     }
     
     //Override function to switch picture
     protected void onFocus(int direction){
      _currentPicture = _onPicture;
      invalidate();
     }
     //Override function to switch picture
     protected void onUnfocus(){
      _currentPicture = _offPicture;
      invalidate();
     }
     
  protected void layout(int width, int height) {
    setExtent(Math.min( width, getPreferredWidth()), Math.min( height, getPreferredHeight()));
  }
   
  //update the fieldchange
  protected void fieldChangeNotify(int context) {
      try {
       this.getChangeListener().fieldChanged(this, context);
      } catch (Exception exception) {
      }
  }
   
  //Since button is rounded we need to fill corners with dark color to match
  protected void paint(Graphics graphics) {  
   graphics.setColor(Color.BLACK);  
         graphics.fillRect(0, 0, getWidth(), getHeight());
         graphics.drawBitmap(0, 0, getWidth(), getHeight(), _currentPicture, 0, 0);
  }
 
  //Listen for navigation Click
  protected boolean navigationClick(int status, int time){
   fieldChangeNotify(1);
   return true;
  }
 
 }
 
 
 }