void __fastcall Prior();
Moves to the previous record in the dataset.
Fetches the previous record and makes it the active record. If the dataset is unidirectional, it raises an EDatabaseError exception at this point.
Fetches any additional records required for display, such as those needed to fill out a grid control.
Sets the Bof property to true if the first record in the dataset was already active.
Broadcasts the record change so that data controls and linked detail sets can update.
Note: TDataSet uses internal, protected methods to move the active record and to fetch additional records required for display. In TDataSet, these internal methods are empty stubs. Descendant classes implement these methods to enable the Prior method to work.