How can I debug an external static lib which is used by PB?

[IceSoft]

Im working on the Chipmunk4PB wrapper (Chipmunk 6.0.2) but I getting a big mistake.

On C++ it is working well.
Linking with PB it makes differences which I don't have with the 5.3.4 Version of the staic Lib.

So my Question is:
Can I debug the staic lib which is part of a PureBasic executable (I have the sources of the lib, lib is debug mode compiled).
If yes, how?
I use VS2010 Premium.

Thanks
Icesoft