/** @return */
 public CExpression GetFirstOperand() {
   return m_expMaster.GetFirstConditionOperand();
 }
 /**
  * @param expression
  * @return
  */
 public CExpression GetSimilarExpression(CTermExpression expression) {
   m_bIsDefaultOperatorSetted = true;
   if (m_expMaster == null) return null; // PJD: wil crash
   return m_expMaster.GetSimilarExpression(expression);
 }