Call Assign to copy the properties of another object on to this TIBGeneratorField instance. TIBGeneratorField overrides the inherited method to copy the Field, Generator, IncrementBy and ApplyEvent properties of the object specified by Source if it is another TIBGeneratorField instance. 

If Source is not another TIBGeneratorField, Assign calls the inherited method, which allows any objects that know how to assign themselves to a TIBGeneratorField to copy their properties.