Component uninitialized; attr changes do not propagate as expected

uninitialized.enaml

# System:
# OSX 10.7.4
# Qt 4.8.0
# PySide 1.1.1

from enaml.stdlib.radio_group import RadioGroup

DEFAULT_TRIGGER_METHOD_NAME = 'request_refresh_task'


enamldef Main(MainWindow):
    id: main

    attr trigger_methods = {
        # Triggering the widget_needs_updating event
        # immediately after widget.main_component is created
        # results in that component being uninitialized
        # every time.
        'directly': lambda main: main.widget_needs_updating(),

        # Using call_on_main resulted in widget.main_component
        # being uninitialized at the time of event trigger
        # in 100% of cases.
        # https://github.com/enthought/enaml/blob/master/enaml/components/abstract_application.py
        'call_on_main': lambda main: main.toolkit.app.call_on_main(main.widget_needs_updating),

        # Using a timer with 0ms timeout is not reliable.
        # In than 50% of cases, widget.main_component is initialized
        # by the time we trigger the widget_needs_updating event,
        # but occasionally it is not.
        # https://github.com/enthought/enaml/blob/master/enaml/components/abstract_application.py
        'timer': lambda main: main.toolkit.app.timer(0, main.widget_needs_updating),

        # Using toolkit.app.schedule with a priority >= 50
        # appears to result in desired behavior in 100% of cases.
        # If priority is < 50, widget.main_component will
        # always be uninitialized.
        # https://github.com/enthought/enaml/blob/master/enaml/components/abstract_application.py
        'schedule49': lambda main: main.toolkit.app.schedule(main.widget_needs_updating, priority=49),
        'schedule50': lambda main: main.toolkit.app.schedule(main.widget_needs_updating, priority=50),
        'schedule100': lambda main: main.toolkit.app.schedule(main.widget_needs_updating, priority=100),

        # We use request_refresh_task to reliably trigger the event
        # after widget.main_component is initialized.
        # Works in 100% of cases, and seems semantically appropriate.
        # http://docs.enthought.com/enaml/api_ref/widgets/enaml.core.base_component.BaseComponent.html#enaml.core.base_component.BaseComponent.request_refresh_task
        'request_refresh_task': lambda main: main.request_refresh_task(main.widget_needs_updating),
    }
    attr current_trigger_method_name = DEFAULT_TRIGGER_METHOD_NAME
    attr current_trigger_method << trigger_methods[current_trigger_method_name]

    attr counter = 0
    counter ::
        if widget.main_component:
            current_trigger_method(main)

    initialized ::
        main.counter = 0
        increment.clicked()

    event widget_needs_updating ::
        widget.main_component.counter = counter
        print 'widget.main_component.counter ==', widget.main_component.counter
        print 'widget.main_component.initialized ==', widget.main_component.initialized
        print

    Container:
        CustomWidget:
            id: widget
            initialized ::
                self.recreate_requested()
        PushButton:
            text = 'Regenerate'
            clicked ::
                widget.recreate_requested()
                current_trigger_method(main)
        PushButton:
            id: increment
            text = 'Increment'
            clicked :: main.counter += 1
        RadioGroup:
            items = sorted(trigger_methods.keys())
            orientation = 'vertical'
            selected_index = items.index(current_trigger_method_name)
            selected_label >> main.current_trigger_method_name


enamldef CustomWidget(Container):

    padding = (0, 0, 0, 0)

    attr main_component = None

    event recreate_requested ::
        self.main_component = EmbeddedWidget()

    Include:
        components << [main_component] if main_component is not None else []


enamldef EmbeddedWidget(Container):
    attr counter = None
    attr label << str(counter)
    label ::
        editor.set_text(label)
    TextEditor:
        id: editor
        read_only = True