>I'm afraid I missed that. If you add the MenuStrip using the IDE doesn't it automatically set the MainMenuStrip property?

I already had MainMenu in form.
After I added MenuStrip to form. So I was able to add items to MenuStrip by looking item in MainMenu.
After migration I deleted MainMenu from form.

>MONO? Is that Linux .NET stuff?

www.go-mono.com

> If you have, say, a menuitem in a child form menustrip and programatically >add it to the parent menustrip (rather than attempting an automatic merge) >does that move it or does the same menuitem appear in both menus?

I havent tried programmatic merge.
Merge controlled properties are not implemented so I do'nt belive that this works.

I expect that automatic merge will implemented in MONO in no later than in summer. I'm planning to release my app after that.