Winforms for Mono on Mac, Linux and PC (Redux)

Question

(I asked this question in another way, and got some interesting responses but I\'m not too convinced.)

Is Mono\'s GtkSharp truly cross-platform? It seems to be Gnome

Answer 1

Gtk# is cross platform. However the only platform where it looks nice is Linux/BSD running GNOME. If possible somehow, separate frontend and backend and develop separate user interfaces for Linux, Windows and OS X. Even wx, which does a really good job in looking okay on all three platforms, has its limits.

Working Mac/PC/Linux app in Gtk#? Tomboy runs on all three I think.