Well, i get now no complaints with using Gtk and i get a window with w = Gtk.Window("title",x,y).
But now:
julia> canvas = Gtk.Canvas(Gtk.Window("GraphViz"),512,512)
ERROR: no method GtkCanvas(GtkWindow,Int32,Int32)
btw: I feel bad about broadcasting error questions on julia-users, shall i move to the git,issues of Gtk.jl?