You use the Property inspector to set values for the transition cast member.
The following noneditable settings appear:
3--Normal sets the selected cast members to be removed from memory after any priority 2 cast members have been removed.
2--Next sets the selected cast members to be among the first removed from memory.
1--Last sets the selected cast members to be the last removed from memory.
0--Never sets the selected cast members to be retained in memory; these cast members are never unloaded.