Creating Create and Destroy Messages in a Sequence Diagram

Create and Destroy messages are specified via the Action property on the Detail tab of their property sheet.

• Creating Create Messages
  A message can create an object if it is the first message received by the object and you set its Action property to "Create".
• Creating Destroy Messages
  A message can destroy an object if it is the last message received by the object and you set its Action property to "Destroy".