code: public void restoreScreenParam(String fieldName)
      {
          if (this.getScreenRecord() != null)
              if (this.getScreenRecord().getField(fieldName) != null)
                  if (this.getScreenRecord().getField(fieldName).getFieldName() != null)
          {
              String strFieldName = this.getScreenRecord().getField(fieldName).getFieldName();
              if (this.getProperty(strFieldName) != null)
                  this.getScreenRecord().getField(fieldName).setString((String)this.getProperty(strFieldName));
          }
      }
docs: RestoreScreenParam Method.
  This is a convenience method to restore screen fields to their property values.
  @param iFieldSeq The screen field sequence to restore.