[Gtk-sharp-list] New type introspection code broke Fifteen#

[Duncan Mak]

Mike,

I just update to latest cvs. Fifteen is now crashing when the cursor
enters the canvas. I can scramble the pieces just find, but i can't
click on the pieces.

It's also reproducible that pressing Alt-c (activates the close button)
crashes similarly. Pressing Alt-s (scramble) then Alt-c doesn't crash,
however.

When it crashes, I get not stack trace; the gnome crash dialog shows up,
I wasn't able to get anything informative out of bug-buddy.

-- 
Duncan Mak <duncan@ximian.com>