Matlab won't release mex file

I'm developing a C++ library that I call from Matlab via a mex interface. The mex file and the library are built on MSVS. It works beautifully (including simultaneous Matlab and VS debugging), except, I'm still developing and I need to recompile the mex from time to time. VS won't recompile because Matlab still has the mex file loaded. The only thing that works is to shut down Matlab, which is annoying and wastes my time.

This issue has been discussed in the thread below - and I've tried all the simple things suggested there (as did others with similar results). Steve Lord points me to response 10 in that thread, but, as far as I know, I'm not using Qt Plugin Loader (and I don't even know what it is). I'm just using Matlab and MSVS.

http://www.mathworks.com/matlabcentral/newsreader/view_thread/262089

Why doesn't Matlab have a simple 'release' or 'clear' for mex files?