Standard Shader with Phong Tessellation?

Is there any way to add phong tessellation to the standard shader? I tried to add the Phong Tess CGPROGRAM into one of the subshaders but it creates a new tessellated surface over the standard shader surface instead of tesselating the existing one. I'm very new to shader programming and I have no idea what to do now. So, is there any way to add Phong Tessellation without having to go deep into the cgincludes? Thanks.