You can create associative or nonassociative hatches. Associative hatches are linked to their boundaries and updated when the boundaries are modified. Nonassociative hatches are independent of their boundaries.
Associativity can only be set when a hatch is created. Once a hatch has been created, you can unassociate it, but you cannot associate it again.
To make a hatch associative, set the Associativity parameter of the AddHatch method to TRUE. To make a hatch nonassociative, set the Associativity parameter of the AddHatch method to FALSE.