i fixed the problem. did not find exactly what was wrong but this is how i fix it.
since part part was not showing up in the specification file (Drawing) i just select the part in the tree and hit DELETE.
after that i wento Assemblies->components->add components and search for my part again and...
i created a new specification file from my UG part and when trying to add a view nothing shows up. i checked the reference set (model) and the part is selected when i click on it. The part shows in the tree in UG under the specification file but for some reasons the part does not show in the...