...
- (id) initWithFrame:(CGRect)theFrame cancelEnabled:(BOOL)isCancelEnabled oneDMode:(BOOL)isOneDModeEnabled {
  self = [super initWithFrame:theFrame];
  if( self ) {
      
      //// pm private Start image
      
      UIImageView *background = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"Leerscan.png"]]; 
      self.backgroundColor=[UIColor clearColor];
      [self addSubview: background];            
      [self sendSubviewToBack:background];          
      [background release]; 
      
      //// pm private End image

    CGFloat rectSize = self.frame.size.width - kPadding * 2;
    if (!oneDMode) {
      cropRect = CGRectMake(kPadding, (self.frame.size.height - rectSize) / 2, rectSize, rectSize);
    } else {
      CGFloat rectSize2 = self.frame.size.height - kPadding * 2;
      cropRect = CGRectMake(kPadding, kPadding, rectSize, rectSize2);  
    }
....

background.alpha = 0.3f;