protected void removeBackground(PositionableLabel b){
  for (int i=0; i < backgroundImage.size(); i++) {
    if (b == backgroundImage.get(i)) {
      backgroundImage.remove(i);
      setDirty(true);
      return;
    }
  }
}

protected void removeBackground ( PositionableLabel b ) { for ( int i = 0 ; i < backgroundImage . size ( ) ; i ++ ) { if ( b == backgroundImage . get ( i ) ) { backgroundImage . remove ( i ) ; setDirty ( true ) ; return ; } } }
remove a background image from the list of background images
