Do you have access to the web sites: antibodypedia or protein atlas? Those websites will give information for finding a validated antibody for different purposes: IHC, ICC, western, IP, ELISA. I haven't looked on the Dako or Cell Signaling Technology websites for the anti-TFG antibody, but those companies are the first places I look when I seek an antibody.
We list a few other sources for anti-TGFb that are supposed to work for IHC-p, though we can't verify validation. Just search here: http://www.linscottsdirectory.com/antibodies/mybiosource-inc/TGF-Beta-11078414 and follow the "More Info" links to the suppliers' data pages. Hope this helps.