How to use the xpra.x11.gtk_x11.prop.prop_set function in xpra

def set_active(self):
        prop_set(self.client_window.get_screen().get_root_window(), "_NET_ACTIVE_WINDOW", "u32", self.client_window.xid)

def _write_initial_properties_and_setup(self):
        # Things that don't change:
        prop_set(self.client_window, "_NET_WM_ALLOWED_ACTIONS",
                 ["atom"], self._NET_WM_ALLOWED_ACTIONS)
        prop_set(self.client_window, "_NET_FRAME_EXTENTS",
                 ["u32"], [0, 0, 0, 0])

        self.connect("notify::state", self._handle_state_changed)
        # Flush things:
        self._handle_state_changed()

def root_set(*args):
    prop_set(gtk.gdk.get_default_root_window(), *args)

def set_tray_visual(tray_window, gdk_visual):
    prop_set(tray_window, TRAY_VISUAL, "visual", gdk_visual)

def save_xvfb_pid(pid):
    import gtk
    from xpra.x11.gtk_x11.prop import prop_set
    prop_set(gtk.gdk.get_default_root_window(),
                           "_XPRA_SERVER_PID", "u32", pid)

def xset_u32_property(self, target, name, value):
        prop_set(target, name, "u32", value)

def _write_initial_properties_and_setup(self):
        # Things that don't change:
        prop_set(self.client_window, "_NET_WM_ALLOWED_ACTIONS",
                 ["atom"], self._NET_WM_ALLOWED_ACTIONS)
        prop_set(self.client_window, "_NET_FRAME_EXTENTS",
                 ["u32"], [0, 0, 0, 0])

        self.connect("notify::state", self._handle_state_changed)
        # Flush things:
        self._handle_state_changed()