inline __fastcall virtual TDBISAMDBDataSet(Classes::TComponent*
      AOwner) : TDBISAMDataSet(AOwner) { } 

You should not use this constructor to create an instance of this component directly. Instead you should create an instance of a TDBISAMTable or TDBISAMTable component, which both descend from this component and provide a published interface for use at design-time.