code: public boolean isPrintableControl(int iPrintOptions)
      {
          String strButtonDesc = ((SButtonBox)this.getScreenField()).getButtonDesc();
          if ((strButtonDesc == null)
              && (((SButtonBox)this.getScreenField()).getImageButtonName() != null)
          	&& (!this.isSingleDataImage()))
                  return false;   // Image only buttons are ignored in HTML
          return super.isPrintableControl(iPrintOptions);   // Return true
      }
docs: Display this sub-control in html input format?
  @param iPrintOptions The view specific print options.
  @return True if this sub-control is printable.