Sorting with CartridgeAddRemovePriorityComparator implies that cartridges should be stored in IApplication in a specific order, for instance, "mysql" should precede all other cartridges. If Edit Embedded Cartridges wizard is run once, the desirable order is guaranteed. However, if wizard is run twice, with "postgresql" selected on the first run and "mysql" added on the second run, the cartridges will be added to IApplication unsorted by the comparator.