code: public String getProperty(String strProperty, String strParams)
      {
          String strValue = null;
          strValue = this.parseArg(strProperty, strParams);
          if (strValue == null)
              strValue = this.getRecordOwner().getProperty(strProperty);
          return strValue;
      }
docs: Get this property.
  First, see if it's in the param tag, then work your way up the hierarchy.