In Shooker v. Superior Court (2003) 111 Cal.App.4th 923, the court explained, "The designation of a party as an expert trial witness is not in itself an implied waiver of the party's attorney-client privilege because his initial status is that of a possible expert witness. If the designation is withdrawn before the party discloses a significant part of a privileged communication (as in this case), or before it is known with reasonable certainty that the party will actually testify as an expert, the privilege is secure; if the party provides privileged documents or testifies as an expert (such as by stating his opinion in a declaration or at a deposition) the privilege is waived. " (Id. at p. 930.)