* using the {@link TransactionContext} handler available in the
* {@link DiagramClass} of the specified {@link Diagram}. The diagram must
* contain a valid value for the {@link DiagramHints#KEY_MUTATOR} hint which
* using the {@link TransactionContext} handler available in the
* {@link DiagramClass} of the specified {@link Diagram}. The diagram must
* contain a valid value for the {@link DiagramHints#KEY_MUTATOR} hint which