def __init__(self, manager, parent, controller):
""" Creates a new tree. """
# Base class constructor.
MenuBar.__init__(self, parent)
# The parent of the menu.
self._parent = parent
# The manager that the menu is a view of.
self._manager = manager
# The controller.
self._controller = controller
# List of menu items
self.menu_items = []
# Create the menu structure.
self.refresh()
# Listen to the manager being updated.
self._manager.on_trait_change(self.refresh, 'changed')
self._manager.on_trait_change(self._on_enabled_changed, 'enabled')
return
