【VB.NET】DataGridViewのEnter押下時に改行させない方法

Public Class DataGridViewEX
    Inherits DataGridView

    Public Event OnPress(rowIndex As Integer, olumnIndes As Integer, val As String)

    Protected Overrides Function ProcessDialogkey(keyData As Keys) As Boolean

        If (keyData And Keys.KeyCode) = Keys.Enter Then
            Me.EndEdit()
            RaiseEvent OnPress(CurrentCell.RowIndex, CurrentCell.ColumnIndex, CurrentCell.EditedFormattedValue)
            Return True
        End If

        Return MyBase.ProcessDialogKey(keyData)

    End Function

    Protected Overrides Function ProcessDataGridViewKey(e As KeyEventArgs) As Boolean

        If e.KeyCode = Keys.Enter Then
            Me.EndEdit()
            RaiseEvent OnPress(CurrentCell.RowIndex, CurrentCell.ColumnIndex, CurrentCell.EditedFormattedValue)
            Return True
        End If

        Return MyBase.ProcessDataGridViewKey(e)
    End Function

End Class

    Private Sub OnPress(rowIndex As Integer, columnIndex As Integer, val As String) Handles DataGridViewex1.OnPress

        MessageBox.Show(val)

    End Sub

   Dim dt As New DataTable
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        With dt
            .Columns.Add("Col1", GetType(String))
            .Columns.Add("Col2", GetType(String))

            .Rows.Add("A001", "B001")
            .Rows.Add("A002", "B002")
            .Rows.Add("A003", "B003")
            .Rows.Add("A004", "B004")
            .Rows.Add("A005", "B005")
        End With

        With DataGridViewex1
            .DataSource = dt
            .AllowUserToAddRows = False
        End With
    End Sub