VS2010 - Loading symbols to debug at design time (Breakpoint will not be hit)

Question

Issue: Breakpoint will not be hit because no symbols have been loaded

Thanks to helpful fellow users I found out how to debug controls at design time: I have to start a 2nd instance of VS2010. Unfortunately, when the 2nd instance of VS2010 starts, it will load all kind of symbols, but exactly not the ones from my project.

In the modules window I can see, that the 2nd instance of VS2010 loads different modules, but I cannot find the dlls from my project. Unfortunately I have no idea how I would reference them, because in the original project they are - of course - included. And from there I do start the 2nd instance when debugging.

If have tried:

1. Set var _NT_SYMBOL_PATH
2. Added the pdb files under Tools/options/Debugging/Symbols/Symbol files locations
3. Checked my dll for exclusion (http://cantgrokwontgrok.blogspot.com/2009/10/visual-studio-unknown-build-error.html)

Any idea how to taggle the issue?