yaf ray and transparency

Support Materials and Textures
1

I ve set up a patch hair with blender and it render fine in nlender but yaf ray don t seem st to support transparency. did someone can help me?
dag

2

It could be this:

http://wiki.yafray.org/bin/view.pl/UserDoc/FaqEng#Q37_I_can_get_YafRay_Lights_to_l