Set of switches (flags) used to specify additional actions that can be done upon DataSet activation.

property ActivationOptions: TNxActivationOptions read FActivationOptions
  write FActivationOptions default [aoAutoAddFields];

Option aoAutoAddFields is set by the default for this property which means that all fields will be added after Active property of connected TDataSet is set to True. Behaviour of this option can be further customised with OnAddFieldQuery event of the grid.