def on_vscrollbar_event_after(self, vscrollbar, event, anchor):
        """Catches CodeBox Vertical Scrollbar Movements"""
        if not self.dad.user_active or self.curr_codebox_anchor != anchor: return False
        if self.dad.codebox_auto_resize and event.type == gtk.gdk.EXPOSE:
            curr_v = vscrollbar.get_value()
            #print curr_v+vscrollbar.get_adjustment().page_size, vscrollbar.get_adjustment().upper
            if curr_v and ((curr_v+vscrollbar.get_adjustment().page_size) >= (vscrollbar.get_adjustment().upper-20)) and (vscrollbar.get_adjustment().page_size > curr_v):
                # 1) the scrollbar is visible
                # 2) we are at the scrolling end
                # 3) the scrolling area is little, this step will probably cause the scrollbar to hide again
                self.curr_v = curr_v
                if not self.dad.codebox_sentinel_id: self.dad.codebox_sentinel_start()
        return False