if (b) addChoosableFileFilter(getAcceptAllFileFilter()); else removeChoosableFileFilter(getAcceptAllFileFilter());
  public void setAcceptAllFileFilterUsed(boolean b)  {    if (isAcceptAll != b)      {	isAcceptAll = b;	firePropertyChange(ACCEPT_ALL_FILE_FILTER_USED_CHANGED_PROPERTY,	                   ! isAcceptAll, isAcceptAll);      }  }