While trying to answer this question I decided I need to step through the marshalling process by hand, in the debugger view.
Unfortunately, Visual Studio seems to jump r
In Visual Studio, you cannot do that, i.e. there is no way to switch VS debugger into a mode to see what is going on during Managed to Native transition.
You could try WinDbg + SOS/SOSEX instead as WinDBG does not hide these kinds of details from you. However, that part is either .NET or Windows internal abstraction, so even if you could see it, you might not get much, as to see what's actually going on there (besides the assembly), you will need private symbols for mscorlib, mscoreei, or clr dlls (pdb files).