Hello Stahta,
Thank you for your post.
I installed wxPack and left it to configure everything. So I tried to create a new wxWidgets Dialog based project, but I thought I have to use wxFrameBuilder. But now I found out I need to use wxSmith.
Since wxSmith is not bad, I've used wxDev-C++ which is IMHO better for building GUI. So I thought FrameBuilder must be the solution, I couldn't find anything about wxFrameBuilder. Google gives me just one hit.
Anyway, since Code::Blocks seems to be THE opensource IDE with everything in it, I can work with wxSmith for now.