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U++ applications without changes to support MacOS application menu will run with menu inside the window.
To properly support MacOS menu, application needs to provide different code for MacOS (conditional compilation depending on PLATFORM_COCOA macro). Usually, the changes are minimal, e.g. in Uword application the only change is
#ifdef PLATFORM_COCOA
SetMainMenu(THISBACK(MainMenu));
#else
AddFrame(menubar);
#endif
replacing the call to AddFrame to add the main menu bar with the call to TopWindow::SetMainMenu.
Other possibility is to omit AddFrame when PLATFORM_COCOA is defined and change menu setting code (which is called on any main menu changes) to something like
#ifdef PLATFORM_COCOA
SetMainMenu(THISBACK(MainMenu));
#else
menubar.Set(THISBACK(MainMenu));
#endif
Another MacOS feature is the dock menu. This can be set using TopWindow::WhenDockMenu.
TopWindow members for MacOS style menu support
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Represents application dock menu. Gets called if TopWindow is on top and user invokes the dock menu for application (e.g. by right-click on application icon).
void SetMainMenu(Event<Bar&> menu)
Sets the main application menu. This menu will be active if given toplevel TopWindow is on the top.
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