Hi Barry - yeah MoI doesn't quite have a regular wireframe display mode - that's because it instead has a hidden-line wireframe mode that you can turn on under View > "Display hidden lines", which makes all the wireframe curves and edges visible in a faint dashed hidden line and also accessible for selection as well. So just for getting at the wireframe that does the job rather than a dedicated wireframe display mode.
But there are a couple of other ways to do it - like Pilou shows above if you go the Scene Browser > Types section, you can use the eye icon to either show all Edges only if everything is currently hidden, or to hide all faces if everything is currently visible. Either of those will leave you with edges only being displayed and that will be just like a wireframe view.
Also if you need to frequently switch in and out of that, there are some various wireframe display related scripts you can put on keyboard shortcuts here:
http://kyticka.webzdarma.cz/3d/moi/#ToggleHiddenLine
- Michael
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