ComboBox does not responds to mouse wheel rotation

I had no problems with it. There was no lock. The mouse wheel worked fine. VS2012 Ultimate.

Public Class Form1

    Dim Test() As String = {"First", "Second", "Third", "Fourth", "Fifth"}

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        ComboBox1.AutoCompleteMode = AutoCompleteMode.SuggestAppend
        ComboBox1.AutoCompleteSource = AutoCompleteSource.ListItems
        For i As Int32 = 0 To UBound(Test)
            ComboBox1.Items.Add(Test(i))
        Next
    End Sub

End Class

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