code: public void init(BaseField fldExcludePackages)
      {
          m_fldExcludePackages = null;
          m_recPackagesTree = null;
          m_recPackagesExclude = null;
          m_fldExcludePackages = (XmlField)fldExcludePackages;
          super.init(null);
      }
docs: Initialize class fields.