docs: public void printDisplayControl(PrintWriter out)
      {
          if (this.getScreenField().getConverter() != null)
          {
              String strFieldName = this.getScreenField().getConverter().getField().getFieldName(false, false);
              this.printInputControl(out, null, strFieldName, null, null, null, HtmlConstants.BUTTON, 0);   // Button that does nothing?
          }
          else if (this.getScreenField().getParentScreen() instanceof GridScreen)
          { // These are command buttons such as "Form" or "Detail"
              this.printInputControl(out, null, null, null, null, null, HtmlConstants.BUTTON, 0);   // Button that does nothing?
          }
      }