When you're debugging and you step into a line of code that has an STL variable, you first have to step into the STL source code. This quickly gets tedious, but there is a way to override this:
Open the registry and edit the following key (this is for Visual Studio 2008):
Create a new
string value "
20" (if it's not already there) and give it the value "
I discovered this trick from this blog post, which shows you how to do it for ATL.