VB.net Add Records to bound DataGridView Mimic Return click

Hi

If I load a bound DataGridView with the right code I can manually add a record at the bottom and when
I click return it will add the record. Is there a way to mimic the Return click using VB.net code?

I tried the following but it did not commit the value. When I clicked in the last row everything dissapeared

       Dim oLastRowIndex As Long = Me.DataGridView1.RowCount - 1
          Me.DataGridView1.Rows(oLastRowIndex).Cells(2).Value = "x"
            Me.DataGridView1.Rows(oLastRowIndex).Cells(3).Value = "y"
            Me.DataGridView1.Rows(oLastRowIndex).Cells(4).Value = "z"
            Me.DataGridView1.Rows(oLastRowIndex).Cells(5).Value = "a"
            System.Threading.Thread.Sleep(10)
            SendKeys.SendWait("{ENTER}")

The following image shows how the code populates the last row. If doing this manually it stays there but with code
once I then click in there it vanishes
I also used the following code to commit the change but didn't help
  Private Sub DataGridView1_CurrentCellDirtyStateChanged(sender As Object, e As System.EventArgs) Handles DataGridView1.CurrentCellDirtyStateChanged
        Try
            'This is used to make sure that a change is commited to a cell
            If DataGridView1.IsCurrentCellDirty Then
                DataGridView1.CommitEdit(DataGridViewDataErrorContexts.Commit)
            End If
        Catch ex As Exception

        End Try
    End Sub