Slab Design in STAAD, RC modul

Hello STAAD.Pro experts!

I am in the middle of a slab design using STAAD.Pro v8i. The model is ready and i am starting to use the STAAD.Pro RC designer. I want to design the slab according EC 2, but when I choose the standard EC 2:1991 or EC 2:2004 I cannot choose "slab" design, just beam or column. if I want to design slab, I can choose BS8110 or ACI 318-05. Do you have any idea, why i cannot design slab using EC2?

I hope someone know the answer for my problem.

Thank you.

HPJ