Shadow on translucent material

[Zafio]

Hi!. I've this character with translucent opacity for the hair:

As you can see, the hair doesn't get any shadow.
I've checked all lighting options, but I can't figure out how to solve this.
Any solution other than using masked opacity?

Thanks!

[immortius]

Perhaps this helps: http://udn.epicgames.com/Three/Creat...singAlpha.html