Some specific things to be done after some action is canceled.
Default implementation is nothing to do, and derived classes
should implement it's specific actions.
Some specific things to be done after element is created.
Default implementation is nothing to do, and derived classes
should implement it's specific actions.
Some specific things to be done after element is deleted from
collection. Default implementation is nothing to do, and derived
classes should implement it's specific actions.
Some specific things to be done after element from collection
is modified. Default implementation is nothing to do, and derived
classes should implement it's specific actions.