How to trigger the databound datagridview append the other newly row

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C#

C#4.0

Description:
1. The datagridview(name is "grid") has three columns(ps: ID, FuelLeftKg, Model) and is databound of objects datasource.
2. When enter the newly row(ps: row head has both Arrow and * icons), will set the default values

private void grid_DefaultValuesNeeded(object sender, DataGridViewRowEventArgs e)
{
   e.Row.Cells[1].Value = 0;		//FuelLeftKg
   e.Row.Cells[2].Value = "AirBus 350"; //Model
}

3. when enter the newly row's last cell(Model) via [TAB], I hope the other newly row will append to the datagridview last.

private void grid_CellEnter(object sender, DataGridViewCellEventArgs e)
{
   if (grid.NewRowIndex == e.RowIndex && e.ColumnIndex == 2)
   {
         grid.CurrentRow.DataGridView.EndEdit();
         grid.EndEdit();
         CurrencyManager cm = (CurrencyManager)grid.BindingContext[grid.DataSource];
         cm.EndCurrentEdit();
   }
}

Qustion:
The newly row only set defualt value and move by [TAB] without any KEYIN. When enter the newly row last cell, there is
NO THE OTHER NEW ROW APPEND after the original newly row? Pls, help. Thanks!