Código Delphi
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DBGrid1.Options := DBGrid1.Options + [dgEditing, dgTitles];
DBGrid1.Options := DBGrid1.Options - [dgEditing, dgTitles];
DBGrid1.Options := [dgEditing, dgTitles];
Tambien para agregar o quitar valores a sets, se pueden utilizar los procedimientos Include y Exclude.
Saludos!