Undefined namespaces

I am making a type library in which I linked another type library in order to achieve custom tab controls. The linked (or referenced) type library can be found here: https://www.codeproject.com/Articles...Second-Edition

Everything works fine, however, because the type library that I am making is to be used with COM and GAC I have to incorporate the linked library to mine. Otherwise, the library is not recognized via COM, even if I make the linked library com visible.

In the process of merging (that is, copying the original TabControl folder and pasting it directly to my library), the problem that I encounter is that I get "not defined" errors. At first I had around 600 errors and with imports I managed to lower that number down to 198. Apart from "not defined" errors I also get a few signature errors. I'm guessing that there is something wrong with the references, but from what I see all references that the tabcontrol library had are present. The only difference, I think, is that it referenced 2.0 versions.

https://i.imgur.com/fr0v1jn.png

Ideally, I would like to keep using the linked library method since it separates projects and works, but then my library wont be recognized via COM. How can I fix these errors? Any help appreciated.