You can modify the labels of derived segments according
to the following rules:
- You cannot modify triggers. They are inherited
from the superclass.
- You can modify actions and guards.
- You can override a guard, but still get changes
on the action.
Modifications to the label of the corresponding
segment in the superclass no longer affect the subclass.
Note: The inheritance color coding of the label and
the segment are independent. The label can be overridden while the
segment is still inherited, and vice versa.