What is the test for a defendant to request a special verdict form that segregates the elements of damages?

"To preserve for appeal a challenge to separate components of a plaintiffs damage award, a defendant must request a special verdict form that segregates the elements of damages. [Citations.] The reason for this rule is simple. Without a special verdict separating the various damage components, we have no way of determining what portionif any of an award was attributable to a particular category of damages challenged on appeal." ( Greer v. Buzgheia (2006) 141 Cal.App.4th 1150, 1158, 46 Cal.Rptr.3d 780.)