plugin destroy

I have written a small plugin with the following activate function. 
Unfortunately it seems that sending "window" as parameter to the action 
confuses something and eog never quits
Is there a close function called when the plugin is deleted, so that I 
can delete the reference to the window object ? looking at the plugin 
code it does not look so ..

or maybe there is another way to get the path to the current image ...


     def activate(self, window):
         ui_manager = window.get_ui_manager()
         self.group = gtk.ActionGroup('CopyImage')
         self.group.add_actions([('CopyImage', None, '_Web Image', "w", 
"Create a sized down copy of an image", self.createCopy)], window)
         ui_manager.insert_action_group(self.group, 0)
         self.ui_id = ui_manager.add_ui_from_string(self._ui_str)


     def createCopy(self, action, window):
         image = window.get_image()
         if  image == None:
             print "No image available"
         else:
            path = image.get_uri_for_display()
            RATECOMMAND.append(path)
            subprocess.call(RATECOMMAND)