Problem with simple DataBinding and Validation with Cancel=true still updates DataSource by TrickAbort

A TextBox Control has a simple DataBinding. When the TextBox Validating Event detects an error, sets e.Cancel=True and exits, the DataSource is incorrectly updated with the invalid data.

Demo program...
1) creates a simple Bind between a TextBox and a test object.
2) defines a Validating event on the TextBox
3) Validating event detects the blank field and sets e.Cancel=true.

Sample Code:

Public Class Form1
    Private _anObject As New aClass

    Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        TextBox1.DataBindings.Add(New Binding("Text", _anObject, "myProperty"))
    End Sub

    Private Sub TextBox1_Validating(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles TextBox1.Validating
        Debug.Print("Validating: ctrl:'{0}' obj:'{1}", TextBox1.Text, _anObject.myProperty)
        If TextBox1.Text = "" Then
            Debug.Print("Set Cancel=true; should not update bound object")
            e.Cancel = True
        End If
    End Sub
End Class

Public Class aClass
    Private _myProperty As String = "aaaa"
    Public Property myProperty() As String
        Get
            Return _myProperty
        End Get
        Set(ByVal value As String)
            Debug.Print("Updating: _myProperty:'{0}' value:'{1}'", _myProperty, value)
            _myProperty = value
        End Set
    End Property
End Class