[Granite instropection] In Granite.Application the properties for about dialog not set

[zodman]

i try to set on Granite.Application the properties for about dialog ( program_name, authors, developers etc) and not work when i call show_about

########################3
from gi.repository import Granite
from gi.repository import Gtk

class T(Granite.Application):
    program_name ="test"

    def do_activate(self):
        win = Gtk.Window(application=self)
        win.connect("destroy", lambda x: Gtk.main_quit())
        self.show_about(win)
        win.show_all()

t = T()
t.run("",1)

####################

output http://i.imgur.com/dfQZs.png

i think the problem is

on the method show_about when call in vala:

Granite.Widgets.show_about_dialog ((Gtk.Window) parent,
                                               "program_name", program_name,

program_name it not take from self.program_name in python.