[maemo-developers] show existing StackableWindow second time

[From: Max Usachev]

Hello!
Please, help me with hiding stackable window.
My app has Main mode and submodes.
Each submode = class instance + its UI. Each mode has Activate method: 
if class instance is exists, then activate method must only show mode 
UI, else, if there is no instance, method must create class instance and 
its UI and show this UI. This is my code, and I can't show UI of 
existing mode second time:

import gtk
import hildon

class SubMode:
     def __init__(self):
         self.window = None

     def activate(self):
         if not self.window:
             self.window = hildon.StackableWindow()
             self.window.set_title("SubMode")
         self.window.show_all()

class TestApp():
     def __init__(self):
         self.window = None
         self.submode_object = None
         self.create_ui()

     def create_ui(self):
         """Create Main mode UI."""
         self.window = hildon.StackableWindow()
         self.window.set_title('Main mode')
         self.window.connect('destroy', gtk.main_quit)
         vbox = gtk.VBox()
         button = hildon.Button(gtk.HILDON_SIZE_AUTO, \
             hildon.BUTTON_ARRANGEMENT_VERTICAL)
         button.set_title("Activate SubMode")
         button.connect('clicked', self.activate_submode)
         vbox.pack_start(button)
         self.window.add(vbox)
         self.window.show_all()

     def activate_submode(self, widget):
         """Show submode."""
         if not self.submode_object:
             self.submode_object = SubMode()
         self.submode_object.activate()


if __name__ == "__main__":
     TestApp()
     gtk.main()



Br,
Max Usachev.