DELPHI - insert an empty edit row at the end of a DBgrid

Question

In Delphi 2007, I have a DBgrid who show data from a TDataSource.

But at the end of this DBGrid I want to add an empty row to permit user insert new values.

I tried to put the fonction Abort in the BeforeInsert procedure of my TUniTable. But I never had an empty row at the end.

Someone can help me ?