TweenLite: can't access a property of a tweened object

hello all

I'm trying to update a dynamic text field based on the scaleY value of a mask that I'm tweening using TweenLite.  Example:  as the mask scales from 1 to 0, the date in my text field would change from 1970 to 1980.  But it doesn't want to broadcast that scaleY property during the tween.  Probably a noob mistake---anyone have a suggestion?

thanks much

LML