def _get_activated_tasks(self, my_task, destination):
return my_task.children<EOL>
Returns the list of tasks that were activated in the previous
call of execute(). Only returns tasks that point towards the
destination task, i.e. those which have destination as a
descendant.

:type  my_task: Task
:param my_task: The associated task in the task tree.
:type  destination: Task
:param destination: The destination task.