def METHOD_NAME(self):
    """Open new game dialog"""
    dialog = newGameDialog.NewGameMode()
    async def coro(dialog):
        def on_gmwidg_created(persp, gmwidg, event):
            event.set()
        event = asyncio.Event()
        self.games_persp.connect("gmwidg_created", on_gmwidg_created, event)
        dialog.run()
        dialog.widgets["newgamedialog"].response(Gtk.ResponseType.OK)
        await event.wait()
    self.loop.run_until_complete(coro(dialog))