AcGIS Engine 10.1 Mouse Wheel zooming

I need change the default behavior of the map control in (.Net app) of the mouse wheel for zoom in/out-- default is roll forward to zoom out, and I need roll forward to zoom in. In 9.3.1, I was able to change the behavior using the registry setting found in this thread

http://forums.esri.com/Thread.asp?c=159&f=1707&t=263532

however this does not seem to work for the latest version. Anyone know how to resolve this?

TIA