hotkeys on form windows

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C#

VB

I have form with two TEXTBOX: txtb1 and txtb2.
whith the following function I change the focus between the buttons. when I press ALT+1 the txtb1 TEXTBOX get the focus and when I press ALT+2 the
focus go to txtb2 TEXTBOX.

I first need to set the keypreview of the form to true.

Private Sub Form1_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles Me.KeyDown
        If Control.ModifierKeys = Keys.Alt Then
            If e.KeyCode = Keys.D1 Then
                TextBox1.Focus()
            ElseIf e.KeyCode = Keys.D2 Then
                TextBox2.Focus()
            End If
        End If
    End Sub

this function doesn't work if the form have a menustrip.
are there option to disable the alt in the menustrip?