It looks like the mouse wheel does not work correctly with a CMFCPopupMenu. You need to have a menu that is long enough to activate the scroll controls (I have reproduced using the VisualStudioDemo sample so my description will be in regards to this sample).When you use the scroll control to scroll down in the menu - a mouse wheel movement in either direction will automatically jump the menu back to the top.A larger related issue is when you scroll all the way to the bottom of the menu and move the mouse slightly up from the bottom (out of the coordinates of where the bottom scroll control will appear) and trigger the mouse wheel the menu appears to have jumped to the top but it is not repainted so as you move your mouse up the menu item by item it will repaint...
Visual Studio/Silverlight/Tooling version
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