Try setting this property and subscribing to this event.
this.gridControl1.Model.Options.WrapCellBehavior = GridWrapCellBehavior.NextControlInForm;
this.gridControl1.WrapCellNextControlInForm += new GridWrapCellNextControlInFormEventHandler(gridControl1_WrapCellNextControlInForm);
private void gridControl1_WrapCellNextControlInForm(object sender, GridWrapCellNextControlInFormEventArgs e)
{
if(this.gridControl1.CurrentCell.RowIndex == this.gridControl1.RowCount)
{
this.gridControl1.RowCount++;
e.Cancel = true;
this.gridControl1.CurrentCell.MoveTo(this.gridControl1.RowCount, 1);
}
}