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De Darío Álvarez Aranda en trucomanía (www.q3.nu)

Código Delphi [-]
with (Sender as TDbGrid) do 

if (Key = VK_DOWN) or ((Key = VK_TAB) and (SelectedIndex = Columns.Count-1)) then 
begin 

  DataSource.DataSet.DisableControls;

  DataSource.DataSet.Next;

  if DataSource.DataSet.EOF then 
    Key := 0
  else 
    DataSource.DataSet.Prior;

  DataSource.DataSet.EnableControls;

end;

Saludos.