Owner draw menu does not call DrawItem

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When a user right clicks in the view I display a context menu with
TrackPopupMenu. This context menu is derived from CMenu and has owner
draw items on it. The menu's parent is the view. When I run it in the
debugger the view calls CWnd::OnMeasureItem which calls MeasureItem
in my menu class. I fill in the itemWidth and itemHeight members.
However the framework doesn't then go and call either:

OnDrawItem in my view class or
Cwnd::OnDrawItem or
DrawItem in my menu class

I am using Microsft Visual Studio 2005. I wrote a noddy program
because the mechanism appears broken in a more complex program but
DrawItem isn't called in the noddy program either!

What have I missed or is this broken in MFC8?

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