Stack trace: AttributeError: NoneType object has no attribute get_children
Traceback (most recent call last):
File "message_window.pyc", line 738, in _on_notebook_switch_page
File "chat_control.pyc", line 2266, in set_control_active
File "chat_control.pyc", line 813, in set_control_active
File "chat_control.pyc", line 954, in redraw_after_event_removed
File "message_window.pyc", line 557, in redraw_tab
AttributeError: 'NoneType' object has no attribute 'get_children'